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The Osprey Argon 85 Backpack carries all you need for a whole week in the hills and, thanks to the ReCurve Suspension system, keeps you comfortable every step of the way. Even with 70lbs of gear loaded into this pack's 5300cu inch interior, the AirScape back panel and BioForm waist-belt eliminate pressure points.

  • ReCurve suspension features an HDPE framesheet, two aluminum stays, and dual aluminum rods for the active transfer of weight to your hips
  • AirScape back panel features three different foam sections for plush comfort and an integrated air chimney for supreme ventilation
  • BioForm CM A/X hip-belt features thermo-moldable foam so you can dial in the perfect fit (for info on custom molding: www.ospreypacks.com/en/web/custom_molding)
  • Removable AquaSource hydration sleeve converts to a hydration pack for summit bids (water bladder not included)
  • Removable top lid converts to a lumbar pack for day-treks
  • Integrated load-lifter straps let you pull your load against your back for improved control and stability over uneven terrain
  • Interchangeable, dual-density shoulder straps easily adjust to fit both men's and women's frames
  • Top-loading access point makes packing easy, zippered side-access port lets you get to gear without having to unpack and repack everything
  • StraightJacket compression wings let you adjust the pack's volume for carrying different-sized loads
  • Osprey's recommended load range: 50 to 70 pounds
  • Reviews
  • Q & A

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Combat tested

  • Familiarity:I've put it through the wringer

I ordered my Osprey Argon while I was in Afghanistan because I was traveling so much from base to base as a contractor. The Argon allowed me to pack all of my clothes, and special gear that I needed to do my job. Made carrying the load much easier with the suspension system and waist belt. That was back in 2008 and I still have it and use it. No tears, rips, holes, or broken anything. I love this pack and it is always ready to go. I am going to buy a smaller pack just for weekend getaways because sometimes it is a bit large take for short term. But for 5+ days this pack is spot on. Please don't forget my 5+ day also includes all the extra gear I have to put in it for work. Easily hauled more than 70 lbs. On one of my military flights it somehow got lost between Kandahar, Afghanistan and Al Udeid, Qatar and ended up on a military flight to Iowa. Fortunately they found it there and shipped it back to me in Germany via FedEx. The pack was never in a bag or or with the rain fly on. I simply had all the buckles, belts, and straps tightly secured and tucked in or rolled and taped. I thought for sure when it was coming from Iowa that it would be ripped or something torn off because of all the rough handling but nope, the pack was in perfect condition.

Great pack!

    Loved this pack, used it very heavily for six months. Rough backpacking in the high alpine desert. Survived all of winter, hiked over 900 miles with this pack on in the six month period, felt comfortable every step of the way, even with loads of 80+ pounds.

    Frame snapped, by accident and blame of entirely myself. Wish they had this pack when I returned it, you'll love it.

    Love this Pack!

    • Familiarity:I've put it through the wringer

    Love Osprey! I've had this pack for three years now and its going strong. So comfy for such a big pack and I usally have 70Lb plus in it. the removable to works great for little hikes away from camp. And how can you go wrong with the almighty lifetime guarantee!

    Love this Pack!

    Like it so far!

      Only had this pack for a few weeks. Used it on a 20+ mile backpacking trip in Moab, UT. Worked great. One complaint, however, is the small stretchy pocket on the outside has a pin hole in it from where it snagged on a boulder. The material is not the type of material that would withstand sharp or tear situations. Only other complaint is the pack does not come with a drinking hose magnet for the chest strap like the smaller water bladders do...nor does the pack come with a water bladder and hose. You can purchase these in a package for additional $$, but I would have liked to see them come with the pack for as much money as I paid for it. Overall I am very pleased with the pack so far however. I would recommend it to a friend. I own an Osprey day pack / water bladder (3L) and love it as well.

      Like it so far!

      Don't like it

        It's comfortable, but there are enough annoying problems with it that I'm returning it. I won't go through the whole list of annoyances, I'll just give you the main ones. First, the detachable top STRAPS on, not buckles, which is maddening. The back portion buckles, but the front of it must be strapped, so you find yourself fumbling with it in the dark or on the trail or in the airport. Second, the side pockets you should be able to reach into on the trail aren't accessible because either the zippers are impossible to work while you're wearing the pack or the because the pockets are just out of reach. Third, and most maddening of all, no matter how you pack it the damn thing will not stand up. When you take it off and set it on the ground it rolls over onto its back, getting the pack and whatever gear you have stowed there muddy. This alone drove me so crazy I went back to my old Kelty pack.

        Looks Good So Far

          I've put my Palisades 80 on the shelf and replaced it with the Argon 85. I haven't put it through it's paces yet but after loading 30 pounds in each and doing some laps ... the Argon is the overwhelming winner!! It all comes down to fit and this one fits me the best.
          The Argon is wider and therefore the weight rides lower. The unique, back hugging shape of the Argon suspension also keeps the weight tighter. You just don't seem to notice the pounds with this thing. Can't wait to load it up and hit the trail!!

          Couldn't ask for a better pack

            Thought I'd write a review of this bad boy after owning it for about 3 years. I've backpacked for about 12 years, and this is the best pack I've had so far. I won't get into all the technical bells and whistles because everyone has their own opinion on that stuff. I've used this pack for ski mountaineering and general wilderness backpacking. I have spent entire days with this pack wading up rivers, sneaking around casting to wary trout while nearly forgetting I had 65 lbs. on my back. Moderate to long alpine trips in the Rockies, 2 months in the New Zealand bush, light loads to massive loads, it really does it all while keeping you as comfortable and pain free as you can be while hauling around a bunch of weight on your back. Don't fret over the price either, worth every last penny.

            Couldn't ask for a better pack

            like your review, but love your photo even more. As an angler i can appreciate not putting down the pack and getting a few more casts in. Most impressive is all I can say. Way to go, and happy trails. I have been wanting to upgrade packs and believe the Argon 85 will be it for my 2100 mile Appalachian Trail adventure.

            Argon 85

              This pack holds a ton of gear very comfortably, thanks to the belt and suspension, but it is a bit heavy as a trade-off. I can't afford a separate (lighter weight) "climbing" pack so I manage just fine with the extra weight.
              BE SURE TO TAKE CARE WITH SIZING AND CUSTOM BELT MOLDING!
              I was shocked during my purchase to find that I was barely a size Medium (I wear L - XL everything) so make the effort to be sized and fitted, as well as having the belt custom molded to your body (Authorized Osprey dealers have a trick little oven to do this) the result is a pack that I can carry 50lbs in all damn day without losing my smile.

              Comfortable, but it takes practice to load and adjust correctly

                This bag can definitely take the weight. With 2 weeks of expedition gear and rations being hauled over boulder and snow fields, around steep ledges/ lakes/ reindeer trails... I always felt like I could count on this pack to not destroy my back/ hips. I really like the side water bottle holder that is a type of nylon fabric and keeps a 1 liter Nalgene completely secured away. I also tucked my map for the day into this pocket with the water bottle. The brain is a good design but I would have preferred one pocket instead of the two (one small one large-- the small is useless). The outside mesh with the osprey logo on it is a waste of material in my opinion, but came in handy for picking up random trash. The gear loops on the bottom of the bag I cut off mid trip and fashioned them into a belt for my pants when I lost mine, I wasn't sad to see them go as it was one less thing that could potentially snag. The brain I would also take off and empty and use as a seat around camp to keep dry and warm. It's supposed to be a day pack but it wasn't ever particularly useful for me-- it wasn't comfortable to wear as a fanny pack and too small to keep a essentials like an extra layer, first aid kit, and water in for a day hike. That being said, I do like the false bottom and compression straps for keeping a small load in a large pack for impromptu peak ascents on an expedition.

                The bag material is good quality, this is my second osprey bag and the other I use for canyoneering. Both have taken a serious beating on rocks and still look new.

                That being said, this pack is kind of like a fancy car in the outdoor world. It looks good, but it isn't always the most functional for the way that I've taken a liking to packing. Too many straps/outside pockets and with the frame, it can be hard to really stuff the bottom of this pack full. I'm a big believer in keeping everything your hiking with secured inside the pack so you're not leaving a gear trail to your campsite, and to keep everything dry by lining the bag with a garbage bag and tying it off at the top.

                Overall, I like this pack and I'll continue to use it, but the next expedition pack I get won't have so many external pockets and other features that are really more of a design element.

                Comfortable, but it takes practice to load and adjust correctly

                Great pack and great company

                  I bought the Argon 85 in 2010 but an injury prevented its use until a few weeks ago. When assembling my gear, I noticed the hip belt had not been shipped with the pack. I called Osprey and they immediately shipped me a hip belt, and they covered the shipping cost for a two-day delivery. Unbelievably great customer service!. And as stated by others, the pack performed great...comfortable and well organized.

                  Takes Load Well

                    OK. I'll try and make this straight to the point and clear. I wouldn't go as far as to say that this is the best pack ever. It doesn't have every feature I'd like for mountaineering. For example, it could use some webbing loops like two daisy chains or something for more strapping. However, it is definitely a good all around pack and it's definitely a good purchase. It carries load much better than my last pack which was something closer to a rucksac made by REI. I recently took the pack with me to climb Mt. Shasta. I hauled up tons of gear including a 60m climbing rope to practice some snow climbing stuff. The most packed it got was on the descent from base camp. At that point rope, sleeping pad, probe, shovel, ice axe, crampons, snowshoes, helmet, WAG bag, top rain/snow shell, were all strapped on the outside of the pack. The rope, top shell, and WAG bag were secured under the top flap. It was a little awkward getting it all strapped on. I tie a cordlette using four small loop sewn into the front of the pack. Things definitely fit better when I'm wearing at least one of either my crampons or snowshoes so that both aren't strapped on. The shovel head fits well in the front wide pocket. The hip belt comes out, but I'm not sure from which points I would haul the pack from. I personally like the bottom access...I put my sleeping bag and bivy sac in there (easy access). The top flap has lots of space for store oft-used items. There's a strap inside at the top that compresses from the top. I found this useful for securely the rope as well. The fanny pack option is a little annoying. The buckles come out and get in the way. I don't even like the concept of a fanny pack...I prefer bring a super thin stuff sack type pack (but I don't normally do that).

                    Best Pack EVER

                      I cant praise this pack enough...
                      Most amazing most comfortable pack I have ever used
                      Ive had it loaded with over 120lbs of tools water and food for a week long remote trail work trip and it was like a pillow on my back
                      well balanced and doesn't cause you to bend over when carrying heavy loads
                      Would buy again in a heartbeat...you get what you pay for and this is no cheap Kelty...

                      Highly Recommended

                        This backpack is amazing!!!! I haven't been able to use it on a really long backpacking trip yet but I've had about 30 pounds or so in it for an overnighter and it held the weight perfectly. I can't wait to use it for an extended backpacking trip. I'm very confident in its ability to hold a weeks worth of supply in it especially if you pack it right. I upgraded to the better waist belt and it works great. It has extra padding and is really comfortable. This holds weight perfectly. It is completely balanced on your back and transfers to your waist and chest and shoulder straps evenly. This pack is completely amazing.

                        Great Pack!!!

                          This is one of the nicest pieces of gear I own. I’ve only taken it on one trip so far, and was pleasantly surprised to discover that I haven’t used some of the items in my pack as I apparently brought too many. The good news is that with this pack I can afford to bring few extras without compromising space for essentials. It is unbelievable how roomy this pack is. I love the fact that I can finally fit my oversized sleeping bag where it actually belongs, in the compartment for the sleeping bags, something I couldn’t accomplish with my other backpacks (although in defense of my other packs, the sleeping bag is a bit bulky). I am able to adjust everything to my likings. The compression belts are awesome, and the stretch pocket is surprisingly roomy.
                          The gear definitely contributed to a great experience on my five day trip. I was able to bring enough supplies to last me the entire time, I shared few things with my fellow campers, and I managed to bring some things back. I am now officially an Osprey fanatic.

                          Wow!

                            I do not know what to say about this pack except get one. I was very hesitant to drop this kind of money on an item I use two to three times a year but there are no reservations after the first month with this pack. It will hold more than you need, it will cinch down tight if you are cutting trail "calories" & it will withstand anything you can throw at it. The fit is superb, the comfort unmatched. If you do multi-day trips, I can't imagine that a better pack exists.

                            Awesome Pack!

                              Just received this pack and could not be more impressed. It is large - very large in fact, but is extremely comfortable and well balanced. There are convenient pockets in the lid and an exterior pocket for things you need quick access to. Adjustable elastic straps allow for attachment of a roll, poles, and other gear. The system of straps allows you to keep the load steady and to remove any excess puffiness. I am still figuring out all of the possible adjustment points of this pack. The only confusing point is that there is a tag attached to the waist belt that suggests that it should in some way be custom molded to the owner by an official Osprey dealer and that failure to do so will void the warranty. I successfully used my pack with the waist band out of the box and it was quite comfortable. I would recommend this pack and others by Osprey to anyone..A++++

                              Unanswered Question

                              I'm looking for a pack for multi-day...

                              I'm looking for a pack for multi-day mountaineering trips as well as routine backpacking. How does this compare/contrast to the Aether 85? Will one be better than the other?

                              I am looking at this pack for hunting. ...

                              I am looking at this pack for hunting. For the most part I will be carrying around 50 - 60 pounds. But with a little luck I will be packing out about 100. I know the pack is only rated for 70 but I was wondering if it could handle the extra weight? no pack is comfy at 100 pounds. Will this one loose its charm? I guess I would ask the same question of the Aether 85.

                              Hey Trev,

                              I'd definitely stick with the Argon series over the Aether series for that much weight. The Aether would carry the 50-60 no problem, but push it over 70lb and you'll appreciate the added comfort from the Argon's carry.

                              And since the Argon 110 is built on the same frame as the Argon 85, they'll both handle the same weight fairly comparably. The 110 will maybe organize and carry larger things efficiently, but if you see yourself needing more than 85L of interior volume, go 110L for sure.

                              Can I get a medium torso with a large hip...

                              Can I get a medium torso with a large hip belt?

                              Hello! I'm sorry for my ignorance, but I...

                              Hello! I'm sorry for my ignorance, but I would like to know if the difference between the sizes M, L XL regards only the capacity of the backpack or anything else. I'm not so big, but I really need to carry as much as I can in this backpack. Thanks!

                              No need to apologize!

                              The sizing on this pack is in reference to the torso length. Because the torso length increases the length of the pack, it also slightly increases the internal space.

                              HOWEVER!!! Do not get this pack based on internal space. Please size your torso (http://www.ospreypacks.com/en/web/sizing_and_fitting) and choose the appropriate sized pack. If this pack fits you, it will carry like a dream and you won't notice the weight on your back. If you get a pack that is too big, you won't carry the weight correctly and it will be a nightmare's amount of uncomfortable!!!

                              Hope this helps!

                              Hey. I'm a big guy (6'5", 300 lbs, 42"...

                              Hey. I'm a big guy (6'5", 300 lbs, 42" waist, big, long torso). Any other big guys out there have experience with this? How's the fit? I'm thinking about retiring my "vintage" external frame pack--which I've customized a great deal to make it fit comfortably. I'm looking at a variety of 80-90L internal frame packs.

                              Any feedback is greatly appreciated!

                              Best Answer

                              Just because you are 6'5" doesn't mean you have XL torso length--you may fit better a Large torso better but still need those XL components. You could get the Argon/Aether 85L but exchange the L hipbelt/harness with Osprey for XL waist belt and shoulder harness to better fit what sounds like a XL build.

                              To measure your torso, have a friend measure your back along the spine from the top of your hipbones (run a finger from the bottom of your ribs down your sides until you feel the top part of your hipbones) to the knobby bone at the base of your neck (your C7 vertebra). With Argon/Aether, if your torso length is bigger than 22", go XL. If not, go L. (Note that all Argons come in the XL torso length, but the Aether only comes in XL in the 70L pack.)

                              My best guess is that you'd be an XL, but after years of pack fitting, I am always surprised by the lack of relationship between height and torso length.

                              ALSO no matter which pack you choose to go with, make sure you get your Argon/Aether hipbelt heat molded at a local shop if you can. Heat molding will ensure the best possible fit for both Aether and Argon series packs.

                              I'm a big guy too (just not quite as big) at 6' 3", 265 lbs (used to weigh 310), 42" waist. I scoffed at the thought of getting a Large instead of an XL but when it came down to it, the L fit *ME* better (I'm fairly proportional too, though tend to be a tad more leg than torso). I was even more surprised to find the L hip and chest straps fit rather than having to go with the XL too.

                              As an avid cyclist, I'm accustomed to having all my outdoor gear ideally sized for people half my size forcing me into 2 and sometimes 3XL (or 7XL Euro-size!) shorts and jerseys. The Osprey's size was quite a pleasant surprise.

                              This is all to say that fit is everything. Before dropping the bills online based on preconceived sizing notions, you might want to try some out in person if you can. To be sure, my intent was to do just that- shop local, buy global- to save some cash. But I lucked out and was fortunate enough to find this pack not only in my size locally, but on sale too!

                              Happy trails,

                              Replacing my uncomfortable military internal...

                              Replacing my uncomfortable military internal frame. I have used my old pack for my last 2 trips to Yellowstone's backcountry. This year I will be going for ten days nine nights. I want the best on the market, and so far this one is at the top of the list. Which would be better for my trips in Yellowstone, the Argon 85 or the 110? I'm 6', 215lbs.

                              Best Answer

                              This is a great pack. World of difference from the old Army stuff. The other one would be the Arcteryx Bora 80, or if longer trips and bigger loads are the norm, the Osprey Argon 110 would be the way to go, or the Arcteryx Bora 95. Both of latter packs are "HUGE". Between the Argon 110 and the Bora 80 I own, I prefer the ride and fit on the Arcteryx. For that kind of trip length and load, you really should inventory the gear you plan on hauling, and also see if there's any way to try them on first, even if it means ordering both/all at the same time and returning the one(s) you eliminate from the running. You can even take them out and field test them, and BC will still let you make the return for a full refund (less shipping).

                              Phil is right, these are great. To answer your volume question, about the 85 or 110, you should consider the type of gear you generally carry. Personally, I'd recommend the smaller pack.

                              Ask yourself these questions
                              Will you be carrying a lightweight, high fill power, down sleeping bag or a cheap bulky 0º synthetic? Does your shelter weigh more or less than 2lb/person? Does your kitchen consist of a single titanium pot, or are you bringing your stainless pot set and nonstick pan? Are you bringing more than one set of clothes? How bulky is your sleeping pad- A 14oz Neo Air or 2lb Trail Light? Do you plan on bringing heavy luxuries like a Camp chair, DSLR, Coffee, Fresh fruit/veggies?

                              A couple of things to consider: The 85L will have a better balance and carry better, because it will weigh less, have a slimmer profile, and by necessity have less crap in it. The 110, a gigantic pack by any trip standard, may ruin you: if you have extra capacity, you'll be tempted to bring extra crap.

                              The advantage of the 110 is that if you have heavy gear, it will not require you to buy lighter stuff to make it all fit. Also, you won't need to strap anything to the outside of the pack, which not only ruins balance and mobility, but makes you look like a junkshow on the trail. Finally, if you compress the larger pack right, it may fit just as well as the 85L.

                              I'd personally recommend an 85L as the size for a backpacking trip of any length. I'd reserve 100+ for winter camping and mountaineering.

                              Thanks for the quick and helpful responses. For the record, I will be using canibalized MRE's for the anti-bear advantage(air-tight, burnable trash). I will find out if any of the local retailers carry Osprey for a tryout. I think I'll also measure the pack I've used on my previous trips which was sufficient for slightly shorter treks.

                              Hey there - Simon is right on abaove. Think about your gear. Depends on how much you want to carry. They will feel similar, except, you will have more weight in the 110 (because its bigger!) so it won't be as comfy as it would be if you had less weight! Argon 85-110 are the right choices.

                              would this be a good pack for both ski...

                              would this be a good pack for both ski mountaineering and summer multi day backpacking trips?

                              Best Answer

                              Hey again. Tough call between the Argon, which is burlier, and the Aether 85, which is lighter. Either will carry skis, and are designed for winter mountaineering and summer trail use. There are a few basic variations, but I guess it really boils down to the specific fit of each. If possible, try them both on locally, or order both, test them out, return the one that doesn't make the cut. No grief from BC. These two packs are definitely the top picks in their size range for what you're looking for IMO. Osprey's site has a better outline of the features and specs, check that out first.

                              I'm convinced, after weeks and weeks of...

                              I'm convinced, after weeks and weeks of research, the Argon is the back for me. I have one question I can't figure out... If I wanted to use this pack for hunting as well as backpacking does anyone know if the 70 is big enough for an Elk quarter or should I get the 85?
                              Thanks in advance

                              Is the belt remoldable? As in buying one...

                              Is the belt remoldable? As in buying one used or selling one used.

                              I know the specifications say that the...

                              I know the specifications say that the pack has top side and bottom entry, but I'm really looking for a pack that opens right up around the sides. Does this one do that?

                              Best Answer

                              Big pack, front opens up more or less like a suitcase, right? Not this one, but try the Osprey Aether 85 (item# OSP0179) with the "j-zipper", or the Arcteryx Altra 75 (item# ARC0952) with the front-panel access. Either one of these should fit the bill for you.

                              I own this pack and have used it on several trips. Very roomy! Top access under removable lid with draw string closure. Bottom Sleeping bag compartment accessible at, of all places, the bottom. This pack also has a front access zipper that allows entry into the main compartment from the front. Located just behind the outside zipper pocket and stretch pocket. Very nicely designed pack! Hope this helped.

                              Bigger Belt!? I'm 5'7" and bit more "stocky"...

                              Bigger Belt!?
                              I'm 5'7" and bit more "stocky" than I should be @ 185lb before lunch. I purchased the Argon 85 medium pack that came with a medium belt. I think I need to exchange the medium belt with a large one. Can this be done?

                              It's probably possible to do this. You can try and do it through us, call or chat in and we'll see if we have your size available. Or you can call Osprey directly and see what they have to say. Either way you'll find a solution no reason to lug a pack that doesn't fit.

                              It is completely possible to do this. I have the medium sized pack except I have a small waist belt. You might try going to your local osprey dealer and ask them if they have any in stock. I'm not sure but I think they cost around 30 dollars, don't quote me on that but its probably close to that. If not I'm sure they can order one.

                              Backcountry doesn't sell replacement belts for Osprey packs. REI does, as do a lot of smaller outfitters. When I bought my Aether 60 from REI, they told me to order the belt in the size I needed and return the medium belt that came with the pack in its stead. Worked great. Something to keep in mind when buying Osprey packs...

                              is there size small? tech specs shows size...

                              is there size small? tech specs shows size s-m-l but not xl. under select option, size are M-L-XL. I am bit confused. Is "S" in the tehch spec = to "M" in the select option? can the belt can be changed to other size?

                              Best Answer

                              This link answers that question. There are 3 sizes: medium 5100, large 5300, and extra large 5500.
                              http://www.ospreypacks.com/detail.php?productID=122&colorCode=970&tab=specifications

                              Do you have a digram with suggestions on...

                              Do you have a digram with suggestions on what to pack where in theOsprey Argon? Like sleeping bag, tent and pad? My wife gave it to me for Christmas and I like it's fit/feel and want to be able to get the most out of it. Have backpacked for years used Kelty before. This seems to fit better. just need packing location suggestions. Thanks Tom

                              does it have a hydration compartment

                              does it have a hydration compartment

                              Yes, it does have a spot for it, but I have found that putting it under the hood of the pack is much easier to change when empty. When you close the hood it adds pressure to the bladder and helps the water come out easier, and you don't have to fight with all the gear in your pack to refill.

                              Would you say this pack is too big to hike...

                              Would you say this pack is too big to hike the appalachain trail with?

                              Best Answer

                              The Argon pack is Osprey's premier backpacking pack, and what it adds in a little bit of weight (compared to the lighter Aether series), it makes up for with a whole lotta comfort and a few extra access points. The 85 L packs, if packed right, can carry enough gear for a few weeks. If you want a larger capacity and have the stamina of a mule, take a look at the Argon 110. If you plan on restocking at waypoints every week or so, the Argon 70 would be a better option. Really, it depends on how you're going to hike the AT. Personally, I'd go with the Argon 85 as a happy medium. Whatever you decide on, make sure you find an Osprey dealer and get a custom-molded hipbelt. Osprey makes a durable and comfortable pack and you won't regret purchasing one, no matter what you choose. From one who lives near the AT, enjoy!

                              I am looking at a purchase of either the...

                              I am looking at a purchase of either the Argon 85 or the Aether 85 and need a little help. I realize the Argon is almost 2 pounds heavier but the ease of access to gear through outside pockets is very attractive. I plan on carrying 60 - 65 lbs. on extended hikes. Are both packs thought to be similar in comfort carrying that weight? Also, I am 6ft 210 lbs. Do you think I would need a Large size or XL? Thanks

                              Best Answer

                              I debated this same question not too long ago. You covered the key considerations in weight and access points, but consider it this way: the Argon series is designed to be the premier backpacking line for Osprey, sporting a slightly better suspension than the Aether models. If comfort is more of an issue than cutting precious ounces, then the suspension on the Argon--combined with a custom-molded hipbelt--can protect you from those extra couple of pounds. Personally, if I were buying a bag to spend most my time on defined trails and steady elevations, I'd get the Argon. If I needed a sack for mountain-laden adventures, I'd lean towards the Aether.

                              Concerning what size to get: take a look at the 'View Sizing Chart' information under the product options pull-down menu and base it primarily off of your hip measurements (just above your hip bones, not along a plumber's waistline). If you're somewhere in-between sizes, opt for the larger one since us fellas rarely lose horizontal measurements as the years go by.

                              Personally, I'd only get the Argon 85 over the Aether 85 if I was planning on carrying a heavy load. I can't personally think of a time when I'd need to carry 60-65 lbs personally, but for that kind of weight you definitely want the Argon.

                              Where does a H2O bladder go? Inside main...

                              Where does a H2O bladder go? Inside main compartment or somewhere in the back panel?

                              Anyone have or know where I can see more...

                              Anyone have or know where I can see more pictures of this pack in Mustard Yellow... from what I've seen so far, the blazing bright yellow colour on the stock photo isn't even close to accurate (neither is the blue - looks more like teal in real life).

                              I am planning on doing some extensive...

                              I am planning on doing some extensive traveling through the south pacific and asia hopefully for a year or so. I love the look of this pack but I am wondering about correct sizing.
                              I am 6 ft + and about 180lbs (athletic type build). Would this pack be suitable and in what size?

                              Thanks!

                              I have a similar build and measured a medium for both hip belt and pack size on an official Osprey sizing device ( glorified ruler). I have a 34 waist and have more legs than I do torso. You want your hip bones to sit about an inch under the top of your hip belt. In comparison, I'm a large fit in Arc'teryx packs if you've ever tried those. Hope this helps. check out their site for some good sizing info: http://www.ospreypacks.com/PackTech/SizingandFitting/

                              It probably hinges on your waist, but I would probably go with a large if you are indeed looking at the Argon 85. You are going to get more volume in the large and it would probably fit your torso better. The large also gives your flexibility in allowing you to wear a few layers and have the hip belt still fit comfortably.

                              I'm a touch over 6' tall and weigh 220 lbs. The medium bag fits me perfectly when the adjustment is extended nearly all the way out, and the large fits well when the adjustment is extended nearly all the way in. I prefer the large shoulder harness and hip belt no matter which bag size I have. Ideally, I'm a medium bag with large hipbelt/harness.

                              As a man with a bad back and neck Osprey...

                              As a man with a bad back and neck Osprey has allowed me to get back into hiking and hammock camping. I like to hike in the sierras of CA and explore my area. Not seeing this pack in person I want to know if the top that converts into a pack has its own strap? or would I need to use the waste belt from the pack? Thanks