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Recommended: Awesome Pack

    I have been Backpacking since 1970 in the Boy Scouts and this is hands down this most comfortable pack I have ever carried. On a recent outing I carried 50 Lbs, 6 Miles, in 2 Hrs.in total comfort. Getting a good fit is key to making this happen! Thier is always some room for improvement though, The waist belt pockets could be larger, The side pockets could use some side expansion room, A hook for car keys in the front pocket would be a nice item and d-rings on the shoulder straps. These are all minor items. Overall I plan on getting many years of service out of this Pack.

    Recommended: Awesome Pack

      I have been Backpacking since 1970 in the Boy Scouts and this is hands down this most comfortable pack I have ever carried. On a recent outing I carried 50 Lbs, 6 Miles, in 2 Hrs.in total comfort. Getting a good fit is key to making this happen! Thier is always some room for improvement though, The waist belt pockets could be larger, The side pockets could use some side expansion room, A hook for car keys in the front pocket would be a nice item and d-rings on the shoulder straps. These are all minor items. Overall I plan on getting many years of service out of this Pack.

      The Cadillac of Packs

        I've used this pack for over a year now, and what a year it's been! The Presidential Range, overnights in the 'dacks, a snowshoe trip in the Rockies, this pack excels in all conditions. I upgraded from a p.o.s. Eureeka external frame, and I will never go back. This pack may have a few more lbs to it than some people would like, but they all go towards making it as comfortable as possible over long hikes. Not only are the straps and waist belt designed to feel invisible, the weight is so well distributed on your hips, and hugs so close to your back, that you barely feel a pack at all. This has enough room for a week long trip in the summer, or a 3 day-er with winter gear, and its simplistic design ensures nothing gets lost, but everything has a place. The zip access to the main compartment comes in handy when the pack is in your canoe and you don't want to open up the whole top.

        I'm 6'4", 210lb, and I bought a Large pack, but actually needed a Medium waist belt. Overall, this is the pack I have been looking for.

        Great Pack Design.....However....

          I got this pack about a year ago and have used it on at least a dozen outings. I really like the way the pack is designed. Gregory has made it very easy to keep organized throughout one's journey. I only have two complaints. The first, which is minor is the lack of a rain cover. This is pretty common amongst packs however I would love to see companies integrate a rain cover into packs more frequently. The second complaint a big one for a photographer or hunter. This pack makes a lot of NOISE! The internal frame system makes a lot of noise, which I cannot have when trying to photograph wildlife and remain stealthy. I'm not sure if it was just the pack that I got, or if its a problem with the overall design. Other than those two items of business, I really like this pack, and so would you if you don't mind a little noise.

          Solid pack.

            This is one tough, but comfortable pack. Though you do sacrifice weight and a thicker pack, Gregory makes up with it with its durability and ability to stay organize. I do agree that the side pockets become less and less effective as the main compartment is filled, but the easy access to the several point of the main compartment, in my eyes, help alleviate the issues that that could cause in other packs. I have had no issues with this pack, and would definitely recommend to anyone looking for a solid extended trip pack.

            Great Summer Pack

              Well this is one comfortable pack. I'll give it that, but there are a couple of flaws. First the pros:
              Gregory Suspension. I have never had a Gregory pack that wasn't exceedingly comfortable. This is another. Three zippered access points are also nice. Material is definitely ripstop, throwing this pack on piles of choss and hiking through talus I've never worn a hole through it. .
              Cons: Mine squeaks. Not all the time, but more than I'd want a pack to squeak. I believe it has to do with the carbon in the suspension rubbing on something. The side pockets are worthless. You'd have to be a contortionist to fit anything in them with it on your back. Also, I don't know why all pack manufacturers don't make the lid removable.

              Overall, I don't regret buying this pack. I'd probably recommend it, but warn the people whom I'm recommending it to. I wouldn't use it for anything besides summer backpacking. It doesn't seem like it'd hold up to carrying ice gear or anything like that, but a good summer pack should be on everyones shelf.

              Bring on the Zombie Apocalypse

                This backpack is definitely deserving of the awards.

                First of all, I admit that this pack is on the heavier side, but it makes up for it in comfort. The padded shoulder straps and hip belt do a great job of handling heavy loads that you'll hardly notice. But the main winner on this pack is the big, sticky lumbar pad. It puts the weight right where you want it and keeps it there. Seriously, a heavy load has never felt so luxurious on my back. This pack is a must for multi-day trips. I like it so much that I've even used it as a simple day pack because it's so comfortable. I bagged a few Colorado 14ers with this sucker (not fully loaded) and didn't even feel it there, even when carrying water for two people. The other reviews are spot on about the good adjustability and features too, so I won't repeat what's been said. Believe the hype!

                For you gram counters out there, try this pack on and tell me the extra ounces aren't worth it.

                You don't want the zombies to show up and not have this pack on your back. Do the right thing. Buy it.

                Outstanding pack

                  This is a very well designed, rugged pack for rucking up to 50 lbs of gear. It's a bit heavy, but the exceptional suspension completely negated this for me. I love the multiple access options, burly shoulder staps, easy on-the-fly adjustability,and strap/buckle backup options. If you're feeling sporty, you can adjust the top compression straps to allow you to load this thing about 7 inches taller than the bag appears in the pictures here. The only thing I wish they would add is a daisy chain for lashing on more external gear.

                  solid pack, no major complaints

                    Purchaed this to replace my 12yo+ Gregory Wind River. At 5'11" 240lb, I purchased the Medium as my torso length dictated. Another review metioned purchasing a medium belt on large bag, not sure this will work when it comes to fitting the shoulder straps properly. even with my shorter torso and selecting the medium pack, shoulder straps still have some gaps after lowering to the lowest position. this is a minor point for me. the pack works very well! a recent multi day solo trip to Dolly Sods Wilderness (day time temps, mid 20s) showed this pack to be a capable piece. holds all my winter gear except for the extra ridgerest I bring on extreme cold days, this lashed to the outside easily. the trip consisted of easy rolling mountain top travel wth several stream crossings. the crossings require some nimble rock hopping, the pack was extremely well balanced for this aspect. the winter load being hauled was hardly noticed. there isnt an over abundance of bells and whistles on this piece which I appreciate, just a good solid pack. as with most backcountry gear, make sure you size it properly.

                    Cadillac of Backpacks

                      Took this into the backcountry of Capitol Reef Nat'l Park in UT last spring. We did 36 miles in 2 days, 28 of those on our second day alone. This pack was ridiculously comfortable the entire time. I'm tall and skinny (6'1" and 155 lbs)and I never got sore shoulders or bruised hips. My buddy had another brand of pack and he was feeling the pain around 15 miles into the second day. I have only great things to say about the Baltoro 70.
                      Bonus: the bamboo green color is sick.

                      Carry what you need with the space and comfort for what you want

                        I have taken this pack out on multi-day backpacking trips in the Selway-Bitteroot in Idaho, the Teton Wilderness and Wyoming and the White Mountains in New Hampshire. Whether for 3 days or 6, this pack remains comfortable. First off, I really enjoy the sleeping bag compartment. I find it large enough to store a summer bag and a sleeping pad. The interior of the pack is roomy and accessible from multiple points. The brain of the pack is spacious as well. The pack has an interior sleeve for a hydration bladder. My only complaints are the lack of a clip for a hydration tube, although it works to simply slide the tube between the strap and padding, and the sizing of the hip strap. At 6'2 I use the size large. However, coming it at around 200 lbs, I find myself tightening the hip strap to its maximum and still wouldn't mind it a tab tighter. I hear it is possible to change out the hip straps but I am not sure. Regardless, if you are looking for a roomy, practical and comfortable for multi-day backpacking trips, the Baltoro 70 should definitely be considered.

                        Great Pack

                          I have had this pack for a year now and I love it. I have taken it camping and traveling a lot and it does a great job of holding everything I need while still staying easy on the back. I do have lower back issues and I can spend all day carrying this pack and at the end of the day, my leg muscles are the only thing sore. It does make a little bit of noise when you walk but I assume that will calm down over time. The only additions I would make to it would be be slightly larger pockets on the belt and maybe a detachable daypack. I do understand that this is my first pack so I might be a little bias, but I did a lot of research before purchasing and it was the only one with everything I wanted for the price!

                          Great Pack

                            I have had this pack for a year now and I love it. I have taken it camping and traveling a lot and it does a great job of holding everything I need while still staying easy on the back. I do have lower back issues and I can spend all day carrying this thing and at the end of the day, my leg muscles are the only thing sore. It does make a little bit of noise when you walk but I assume that will calm down over time. The only things I would add would be a little bit larger pockets on the belt, and maybe a detachable daypack. I do understand that this is my first pack so I might be a little bias, but I did a lot of research before purchasing and it was the only one with everything I wanted for the price!

                            A truely great pack

                              I've had this pack for a little over a year and a half now, and I have put it to the test in a wide range of environments. I have used this pack in the chilly Pacific Northwest, the hot and hummid South, and used it as my main travel bag for my deployments to the arid deserts of the Middle East. Tough and rugged to the core, this pack is made to last and keep you comfortable until you get to you're destination. I would HIGHLY suggest that you pick this pack up, you won't regret it!

                              I recently bought this backpack, I bought...

                              I recently bought this backpack, I bought a size small.. When i have the pack on with all the gear in and everything, and have the hip belt on. The excess straps from the hip belt Hang, What exactly can i do to fix the straps from hanging?

                              I have been using this pack (size medium) for about a year and have experienced the same thing. Not really a solution, but I have let the excess length from the straps just hang. As you can see in the photo, there is definitely a lot of extra length, but I have never found it to bother me.

                              I have been using this pack (size medium) for about a year and have experienced the same thing. Not really a solution, but I have let the excess length from the straps just hang. As you can see in the photo, there is definitely a lot of extra length, but I have never found it to bother me.
                              Best Answer

                              Another great option that's a little cleaner than rubber bands and not so permanent as resorting to scissors would be lengths of elastic Velcro to hold the rolled/folded up ends closer to the body of the pack. I know Camelbak did this with their M.U.L.E. backpack and it works great. Sew or glue a length of Velcro a few inches long at the ends of the loose strands at a 90 degree angle, roll the loose ends back on themselves, and close the Velcro around them and around the waist strap (make sure you try this before attaching the Velcro permanently; you want to make sure it's facing the right direction)

                              A little labor-intensive, but very effective.

                              Happy trails!

                              How does this Baltoro compare with the...

                              How does this Baltoro compare with the Z65? The Z seems lighter/minimalist compared to the huge straps/compartments of this beast.

                              First to point out the obvious, the Baltoro is 5 liters larger and nearly 1.5 lbs heavier than the Z65. The Baltoro also has a few extra bells and whistles (e.g., a dedicated sleeping bag compartment with zipper for easy access). They both use the same fabric so general durability should be fairly equal. Where these two packs really differ is in their suspension systems. The suspension for Gregory's Z series is designed to keep the pack away from your back where possible to help promote ventilation and keep your back from sweating.

                              Overall the Z65 is more of a minimalist design compared to the Baltoro. You may find the Z65 a tad small for week long trips, unless you are a minimalist yourself, and only take the bare essentials with you. I personally use the Baltoro and have been very pleased with it's performance. For week long backpacking I pretty much fill the pack to capacity (including tent, sleeping bag/pad, cook set, etc.), without needing to strap anything on the outside. Ultimately I really don't think you can go wrong with either pack.

                              i just got the baltoro 65 and wanted to...

                              i just got the baltoro 65 and wanted to return itso i could get the 70 for its extra space. Is the 70 the same material as the 65? are they the same other than the cubic inches?

                              I posed this same question to Gregory last week and here was his answer:
                              So previous to 2011 we have the Baltoro70. For 2011, we have introduced (with updates) the Baltoro65 and Baltoro75. The biggest difference will be volumes, but we did make a few updates to the design. You can view the new products, and see the product video here: http://www.gregorypacks.com/response-afs

                              So in other words the 65 and 75 have the needed improvements to the 70.

                              Someone else asked about the rain cover...

                              Someone else asked about the rain cover -- I am curious about what size to get.
                              According to Gregory - the medium rain cover is for 60-80L packs (if I remember right) -- but I've seen mention to people buying the large...

                              If you have a rain cover - what size would you suggest for the Baltoro 70?

                              Was wondering, regarding the waist strap...

                              Was wondering, regarding the waist strap - if I were to order a backapack, how do I size it? I have a 38 to 40" waist, 6'0" in height and according to the Gregory Chart, I need a Medium, as my back measurement is a 18 1/2".

                              Thanks!

                              Best Answer

                              Steve,
                              I ordered this pack online while I was in Afghanistan and had it delivered to my parent's house. I needed a small pack, but a bigger waist strap. I placed the order through chat with a Backcountry rep, and they switched the waist strap with no problem. Go the the Gregory site,and it will tell you what size to get. Good luck!

                              I'm a female 5"1, 130lbs and I was wondering...

                              I'm a female 5"1, 130lbs and I was wondering if this pack might fit me? This is my first time doing this and I'm not sure which backpack to get for a 3 day trip.....does anyone have any suggestions?

                              Hey, this might fit you, but it's unlikely that it will fit well. This is a men's pack so it's not designed to fit a woman's body well, you'd be better served checking out a women's specific pack, it would most likely fit you better. For a three day trip, check out the Gregory Deva 60 http://www.backcountry.com/gregory-deva-60-backpack-womens-3500-3900cu-in, it should work very well for a three day trip at any time of the year. Sixty liters should be more than enough to go by yourself for three days, and if you're sharing gear like a tent or stove with other people it should provide you even a little more space than you need, which can be nice.

                              What is the deal with the straps on the...

                              What is the deal with the straps on the bottom of the pack?

                              The straps can be used to hold any number of different things, usually a sleeping pad. They also can be used to compress the bottom of the pack to improve balance if it is at less than full capacity. There are also loops for carrying an ice ax. The straps have multiple buckles and clips for a customized fit, and to allow easy access to the lower compartment of the pack.

                              hope that helps

                              do they make a rain cover for the Baltoro...

                              do they make a rain cover for the Baltoro 70?

                              Best Answer

                              Jordan,
                              They do indeed make a rain cover for this pack, you can find it here at the manufacturer's site, or do a google search to see if other retailers have a better price. Unfortunately it appears backcountry does not carry the Gregory brand one.
                              http://www.gregorypacks.com/products/mens/accessories/6/rain-cover
                              I hope this helps!

                              I'm 5'7 130lbs and throughout most of these...

                              I'm 5'7 130lbs and throughout most of these comments i'm seeing alot of people bigger than me posting excellent reviews. I'm just wondering now how this pack would do with someone my size? would the outward protusion throw my balance off alot? and would this pack overall just fit me comfortably?

                              Best Answer

                              Amador,
                              I am roughly 5'9" and 150lbs. I ordered the small, because my torso length was right on the border of the small and medium version of this pack, and there was a really good deal on the small at the time. The pack is great, but if I had to do it again I would have gotten the medium for myself. You being 5'7 and 130lbs I would definitely go with the small version of the pack.

                              It's a great pack you're going to love it.

                              hope this helps!

                              I'm 5'5 140lb and was what you call a "tween-er". I was at the top of the small torso and the bottom of the medium. I stuck with the small and have had no problems. If you've never tried a Gregory on, you may want to because they are known for a bump on the lower back as a support system, which I, and clearly many people reviewing this pack, like/love, but some people find it uncomfortable. Also, getting sized by someone whose been at it for a while will ensure you don't get any excessive rubbing.

                              where does a camel back fit on or into the...

                              where does a camel back fit on or into the Baltoro? Does it go inside the bag? Thanks

                              So from the pictures of the baltoro and...

                              So from the pictures of the baltoro and the z65, it looks like the baltoro's straps are much bulkier (and maybe cheaper feeling) can anyone confirm or deny this? Which one would you recommend, and why?

                              Best Answer

                              You're right that the straps on the Baltoro are bulkier, but they are far from cheap feeling. They are bulky due to a good amount of padding, which makes it very comfortable. They also use a soft material, almost felt-like, on the side that makes contact with your shoulders. I personally use this pack, and really like it for it's comfort and capacity.

                              I am 6 ft and 175 lbs. 20" torso length...

                              I am 6 ft and 175 lbs. 20" torso length and 34" hips. Gregory site has me right on the border of medium and large. The recommendation from the site is to go with the smaller version if you are on the border. Has that been the best decision for you torso length border riders like me? Oh and I am not close to an outfitter to try one on or I would.

                              Best Answer

                              Hey Jason,

                              I regularly ride the border myself. The choice is subjective, and depends a lot on the specific manufacturer...sometime I go larger, sometimes smaller. The lack of a local source for fitting limits you down to a couple options. One choice would be to go with Gregory's recommendation to size down, but you're then limited to only knowing one side of the equation. The other option would be to order both pack sizes at once, find what works best, then return the other. Backcountry will give you no grief whatsoever in returning merchandise, understands that shopping for gear online is often a case of trial and error, and will process your credit card refund fast. Having both in-hand together, and being able to load them both up for immediate comparison, is a great way to go. Hope that helped.

                              I have the 2008 model of this pack it fits me fine and I am about 5'11" 165 I don't think the extra inch you have on me would matter that much. I do agree with Phil though if you can't try one on, Backcountry is the site to get it from because you can buy one, try it out if you want the other size send that one back for a full refund.

                              A lot of these packs work with velcro connecting the shoulder pads to the frame. If you shorten the suspension to the smallest size, frequently it means that the velcro areas don't line up, therefore less connected velcro, thus less weight bearing capability. In a heavy pack this could lead to separation and your suspension constantly falling apart. In a shorter pack, your shoulder staps would be moved to the top and everything would line up.

                              I just got my Baltoro 70 and noticed that...

                              I just got my Baltoro 70 and noticed that there is no loop in the hydration sleeve to hang my Camelbak and no loop on the shoulder strap through which to run the hydration tube. Am I missing something? There was so much thought put into the fine details of this pack, how could this have been overlooked? Any suggestions on how to keep my Camelbak from sagging so the water flows properly?

                              I've had the same questions; I fix the first one by filling my pack correctly to make sure the bladder doesn't kink... I know that doesn't help your question much, but I've never had an instance where I couldn't easily sip out all of my water. The second issue can be fixed with a tube trap http://www.backcountry.com/outdoorgear/CamelBak-Tube-Trap/CAM0019M.html

                              It fits right on the sternum strap of the pack, so it can be moved out of the way by unclipping that strap when you want to take your pack off.

                              Not the perfect solution, but it has worked for me over a few years of use on this pack!

                              Best Answer

                              Ray, These are two common complaints regarding this bag.

                              Shoulder strap loop - Vince put up the link for the clip offered by backcountry, but Camelbak also makes a plastic clip that attaches pretty well to the shoulder strap. You should be able to find this clip for around $2 at most sporting good stores that carry camelbak products.

                              My solution to attaching the bladder has been to just attach it directly to the bag for the bladder. It actually stays clipped on really well.

                              The pics are both with my baltoro 70.

                              Ray, These are two common complaints regarding this bag.

Shoulder strap loop - Vince put up the link for the clip offered by backcountry, but Camelbak also makes a plastic clip that attaches pretty well to the shoulder strap.  You should be able to find this clip for around $2 at most sporting good stores that carry camelbak products.

My solution to attaching the bladder has been to just attach it directly to the bag for the bladder.  It actually stays clipped on really well.

The pics are both with my baltoro 70.

                              I am a big guy, eggspecialy where it counts....

                              I am a big guy, eggspecialy where it counts. My chest is pretty big too, real big big shoulders. Will a large be big enough, I am nervous about ordering it off the internet.

                              Best Answer

                              Frank, backcountry.com has a fantastic return policy, especially useful for sizing. If you think this is the bag for you, I wouldn't hesitate in buying it and trying it on.

                              If you need additional sizing help for packs, jump on the live chat. They are incredibly knowledgeable and helpful.

                              I'm big too Frank, eggspecially where it counts. If this pack is big enough for me, it will certainly be big enough for you, eggspecially the XL size. Plenty of girth all the way around. If you buy it and think it's too big for ya, this company will always give you an exchange or a refund.

                              Baltoro 70 vs. Palisade 80...I tried on...

                              Baltoro 70 vs. Palisade 80...I tried on the Gregory Palisade 80 and the Osprey Argon 85 in hopes to find a quality 5,000ci +/- pack for a 4 day winter mountaineering trip to Mt. Washington (NH). I also plan to use the pack on Rainer and possibly Denali (planned for 2010 and 2011, respectively). The Osprey didn't fit at all - The Palisade was much better, well balanced when loaded with 50+ lbs., but the extra lumbar padding was not comfortable on the small of my back. One of the Backcountry.com reps told me that the suspension system between the two is different and the Baltoro should fit me better. No local stores carry it for me to try on. I'm concerned about pack volume, because I was able to fit all of my winter camping gear in my 3,000ci, but no more room for food or climbing gear. I'm pretty sure the Palisade will have the volume to fit all of my gear, but I'm concerned the Baltoro will fall short on space. I don't want to sacrafice comfort for the extra capacity. Suggestions?

                              Is your winter mountaineering trip technical--how much gear will you be hauling in addition to your basic winter camping items? I have a 50 liter Black Diamond Predator pack that can carry all my winter camping gear plus a rope, ice screws, helmet, ice tools and a full ice climbing rack. I would think 70 liters would be enough to cover down on the extra food required for a 4-day winter trip. Rainier--I would imagine this would work, but for Denali, from what I've been told, you need something in the 100-115 liter range. Hope this helps.

                              Best Answer

                              I've done a few peaks with this guy in the winter. I didn't have a rope, but I did have a second set of boots (big ones) a second pack (for the technical summit, although this would have worked just fine), a big tent, and lots of food, along with crampons, an ice axe, and the rest of the necessities for mountaineering. Didn't even have to clip stuff to the outside (except the axe; duh)

                              Because I own the baltoro, I'm sure I would try to find a way to cram everything in and make it work for something like Rainier, but I have a buddy that climbs it every year with his palaside and he says he always has it packed to the max. My personal preference is to aim on the small side, because I always fill my pack. A smaller pack helps me be more careful about keeping my overall weight down.

                              would this be a good mountaineering pack?...

                              would this be a good mountaineering pack? i am climbing Mount Rainier in July and am looking for a good versatile pack.

                              Best Answer

                              I've definitely done my share of mountaineering with this pack, and it held up great! I didn't have a rope (my buddy had that), but I did have a second set of boots (big ones) a second pack (for technical summits, although this would have worked just fine), a big tent, and lots of food, along with crampons, an ice axe, and the rest of the necessities for mountaineering. Didn't even have to clip stuff to the outside (except the axe; duh)

                              In addition, this is also my summer pack. Works just as well for high-mileage days due to the nicely padded suspension.

                              My husband hates hip belts. He uses an old...

                              My husband hates hip belts. He uses an old Army rucksack for our backpacking excursions. He typically carries approx. 40 lbs. I want to buy him a new, more ergonomic pack, but he will not use a hip belt. Can the one on this be removed? If so, will that negate the comfort factor and fit? Please advise. Thanks!

                              Best Answer

                              The hipbelt is removable without removing the the lumbar pad, which provides a lot of the comfort, but this pack is designed to shift almost all the weight to the hipbelt while remaining comfortable. The shoulder straps are fine for heavy loads, but the hipbelt and back suspension are what set this pack apart. I wouldn't buy it with the intention to remove the belt, but... heck, if you keep the belt, he might come around!

                              I hike a lot with my bro in law (also an army guy). He frequently hikes with is ruck on our day hikes. Most rucksacks have a hip belt and I have never seen a decent one. If his experience is with a hip belt is coming from army issued rucksacks he should definitely give the Gregory hip belt a try. Like Vince said, it is removable, but make him at least try it.

                              How do I order this pack in a Large but...

                              How do I order this pack in a Large but with a Medium Hipbelt ? Do I have to order a Large and send back the Hipbelt to get a Medium or must I call Backcountry to place the order instead of using the website ? I have not used online shopping much

                              Your best bet would to be to contact Gregory direct. This is similar to asking for a 8.5 left shoe and a 9 right shoe. It is not practical from a business standpoint to sell it that way. I would try the large and see if the belt is still too big. I hope that helps.

                              Best Answer

                              I hate to say it, but I went to EMS for this specific problem. They had a large frame pack and we swapped out the medium hip belt. They didn't charge me anything extra for it because they had everything in house, but you might not be so lucky. Give it a try.

                              I was just curious if this 70L pack will...

                              I was just curious if this 70L pack will fit in an overhead compartment on a plane? Has anyone traveled with this pack fully packed and if so did the airline let you carry it on?

                              Thanks everyone!

                              Best Answer

                              I'm highly skeptical that they'd let you carry this on, or that it would fit in the first place. I traveled from Seattle to Paris with a 42L pack (Black Diamond Sphinx if you're curious) and that barely fit. I don't think there's any way I could have gotten away with almost double that.

                              No. Most airlines follow a policy that no check in bag can be greater than 45 linear inches, meaning if you add the length, width, and height, it should equal less than 45 inches (some airlines give actual dimensions, but you'll notice that they follow this guideline). This pack is greater than 45 linear inches.

                              I frequently travel overhead compartment only with my Black Diamond 50L Predator backpack--STUFFED! Yes, it's true. It never really looks like it'll fit, but backpacks are generally soft and flexible. Once the hipbelt is past the lip of the compartment door, it's good to go. I certainly haven't had any "Meet the Parents" encounters with a nasty flight attendant.