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  • Mountain Hardwear - South Col OutDry 70L Backpack - Shark

Mountain Hardwear South Col OutDry 70L Backpack

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    • Shark

    16 Reviews


    One pack that functions like three.

    Each section of your ascent brings different challenges. You could bring a different pack to handle each one, or you can just bring the lightweight Mountain Hardwear South Col 70 Outdry Backpack, which is basically three packs in one. It's got plenty of space for a two-day winter mountaineering trip, and strips down to the basics to help on the summit push—you can pop off the top pocket, slide out the padded Hardwave suspension framesheet and aluminum stay, reduce the padded waist belt to a simple nylon webbing belt, and go fast 'n' light all the way to the top. 

    When you're carrying a heavier load, leave the suspension in and walk cross-country in comfort. Along with rugged nylon fabrics, the South Col is kitted out with an OutDry waterproof membrane, which will keep all the gear in the main pocket dry as a bone, and features a front zip pocket that's easily accessible and maintains its volume, even if the bag is stuffed full. There are tons of lash points and straps for carrying skis, ice axes, and poles, an easy-access crampon stash pocket, and a top skirt that extends to give you an extra 300 cubic inches of space. Never bring two packs again.

    • Removable Alpine HardWave suspension, aluminum stay, padded waistbelt, and top pocket
    • Small/Medium fits torsos from 16-19 inches
    • Carries up to 60lbs
    • Top access
    • Durablie nylon fabrics with OutDry waterproof membrane
    • Front gear pocket and easy-access crampon pocket
    • Ski, ice axe, and pole carry
    • Compression straps
    • Item #MHW004K

    Tech Specs

    [body] 400D HD nylon, [membrane/laminate] OutDry, [bottom] 840D HT ballistic nylon, [front] HardWear X-Ply ripstop
    70L (4270cu in)
    HardWave framesheet, Alpine suspension
    1 removable top, 1 front, 1 crampon
    Claimed Weight
    3lb 4oz
    Recommended Use
    mountaineering, ski mountaineering, alpine climbing
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Carries everything you need and more

    • Familiarity: I've used it once or twice and have initial impressions

    Got this for multi day ski mountaineering trips. Carries crampons, ice tools, and skis - all on the outside. Still have 70 L worth of space for the rest of the gear.

    Versatile, tough as nails

    • Familiarity: I've put it through the wringer

    Love this pack. Wanted to wait until I had given it plenty of use before I wrote a review. In the 2 and a half years I have owned this pack it has served me very well. Bombproof- the outdry material used on this thing feels like it could stop a knife (or crampon points). The loops and gear pockets are very well thought out, especially for alpine use. Honestly there are so many different features on the exterior of this pack I feel like I figure out a better way to load it every time I use it.
    I will say this: the one drawback as others have mentioned is the hip belt lacks padding. This is not an Osprey Aether summer pack. I have a Gregory Baltoro that is more comfortable to wear for long trips. However, I find this tool excels in winter/cold weather climbs where I am layered up with clothing so the hip belt does not bother me a bit. The fact that I can strip this down for a summit push makes it worth its weight in gold.
    Again, this is a specific tool and fulfills its purpose beautifully. Take a baseball bat to the golf course and you'll be disappointed. If you are after an alpine pack that will give you peace of mind to keep your gear dry and secure, look no further.

    Truly waterproof & lightweight

      I love this backpack for longer excursions where I need to bring more gear. The support in the back takes so much of the pressure off and ultimately makes it feel lighter even when packed full. It also has enough room to fit my tent, sleeping pad/bag, camp stove, food, and clothes perfectly. The bag is also truly waterproof. It’s kept my gear dry in complete downpours while hiking through the mountains. The waist belt was a little stiff for my hips because I’m thin and they are bony. So with a lot of weight I had to adjust the bag even higher on my back to avoid pinching my hips too much. Other than that, perfect bag with a huge capacity.

      Its dirty as hell and Ill keep using it.

      • Familiarity: I've put it through the wringer

      I have waited to review this after a couple of trips to give my proper opinion. The Outdry tech is fantastic. I leave this on the glacier and pools of water develop underneath. Nothing is wet on the inside. The bag is spacious and could pack down pretty small. The crampon bag on the outside is clutch and will never buy another backpack without it. The outer most layer on the back is tough as hell. I was bushwhacking through some tough terrain and not a single tear. I do have a couple of gripes so I couldnt give it the full 5. The hip belt loops are helpful. I did some technical alpine rock in this and it carried well. Not ideal and definitely not its function but, carried well.

      It is a bit on the heavy side but, it can take a ton of weight.
      There is no water bladder functionality (probably because it would ruin the outdry system of "waterproof").
      The front pocket does not extend. So if you pack up the bag pretty hard, the front pocket is almost useless. I found this extremely frustrating.

      Great function, Very light

      • Familiarity: I've used it once or twice and have initial impressions

      I thought this pack hit its mark pretty well- going with the removable suspension for a lighter load, but still giving you enough structure to maintain a comfortable trip. I love the bomber OutDry waterproof membrane that MHW uses on their packs. It leaves zero feelings of insecurity when it comes to durability and waterproofing. I did think that the waist belt left something to be desired, as it was pretty skimpy for a 70L pack. However, overall I was able to carry a pretty large amount of gear for a trip in big cottonwood canyon. It was getting a little colder so it was nice to be able to pack and carry all of my layers and other luxuries comfortably for this excursion. I've only gotten to use it a bit, but I've really enjoyed it!

      Love/ Hate

      • Familiarity: I've used it several times

      I have a love hate relationship with this pack. There are so many great features, but one big miss on this pack. I absolutely love the idea of being able to strip down the pack for the summit bid, the dedicated crampons pocket, the OutDry technology, and the hip belt gear loops. I think one big miss on the pack is the suspension system. It can be quite uncomfortable, as many have noted. I believe this is due to the strip down feature to go fast and light. I think for mountaineering this is a key area in a pack though and I am sure will be addressed in their next go around with these packs. I did give it 4 stars because of the versatility with the built in summit pack and if you’re going for a quick/ light trip, it can be a great pack. If you are packing in on a bigger expedition, with a heavier pack, then there might be a better suspension system to accommodate.

      Feel free to reach directly out to me with any questions about this pack or anything at all for your next big expedition!


      • Familiarity: I've put it through the wringer

      Had it just over a month and used on the very notable The Enchantments, Mt Baker, and Mt Rainier climbs (among other WA overnights). Love the pack layout,features and suspension. However, literally every buckle has broken and 1 of the 2 strings for sealing the pack have ripped. Totally unacceptable. Backcountry won't allow me to return it despite these defects. Last time I buy a pack from when REI will allow me to return it.

      Hey Richard,

      I'm sorry to hear about your troubles. I'm not sure who you spoke with here but that definitely sounds like a warranty issue that either we can handle in house (all dependent on the vendor) or MHW would gladly help you out with. Feel free to email me at with your order number and I can look more into it for you!


      Disappointing Suspension

      • Familiarity: I've put it through the wringer

      I used this pack for two seasons, logging hundreds miles of backpacking, and many long approaches and mountaineering trips. I was at first in love with this pack, but quickly realized that it's limited by the build quality and design of the suspension system.

      ->When it was brand new:
      This pack is quite light, waterproof, and has great attachment points. For the first few trips I took it on I could carry 40-45lb loads with no problem.

      -> As it aged:
      Over time, the padding on the hip belts and the shoulder straps began to deteriorate. The foam padding, which is meant to make the hip belt and shoulder pads bearable, eventually slid out from under the nylon hip belt. After more and more trips with this backpack, the padding became so worn down and misaligned that my hips and shoulders would become scabbed with higher amounts of weight.

      -> Design issues:
      One thing to note is that this pack has almost no lumber padding. At first I didn't mind this but I soon realized that it puts more weight on your hips, further complicating the problem mentioned above. I've also had two of the lightweight plastic clips break under tension, and one of the zippers has failed.

      All this to say, If you're looking for a pack to use occasionally for lightweight loads, this pack may be a great fit. If you're looking for a pack to last a long time and to use for longer trips or weights over 40lbs, I'd stay away from this.

      favorite pack

      • Familiarity: I've put it through the wringer

      I love the many unique features of this pack. The tough material on the outside of the pack is awesome. I'm hard on my gear and this has extended the life of my pack tremendously. I use it to go to and from the crag, I use for weekend backpacking trips with the extension from the 45L to the 70L to fit my stove, food, layers, tent, etc.

      favorite pack

      Not sure, pretty cool, I guess

      • Familiarity: I've used it several times

      So, I've used this for some training hikes and a couple of overnight trips for about a year and now planning on using it for Mt. Rainier. Not sure what the deal is with this pack but the hip belt rides really low with any appreciable amount of weight in it. It's barely tolerable with approx 40lbs but anything over that is uncomfortable. I originally got the M/L and had to exchange for the S/M. It may be the design of this pack but it seems odd that it wouldn't carry more weight comfortably and that it would sag so low, right over where a climbing harness would be. Every time I have used this pack with 30+lbs, it has been to warm to wear any type of insulation layer, which might help, but I just don't see why it feels like a 10 year old hanging off my back when it is built for mountaineering. Removing the frame sheet and top lid and swapping out the hip belts for a lighter summit pack is a pretty cool design which makes me give it 4 stars, but I'm not sure why it doesn't carry a heavier load better. After all, mountaineering packs get heavy! Maybe I'll have to rethink my packing configuration (which makes no sense). Anyone else have this issue? Solutions and/or suggestions welcome. Oh, and B-T-Dub's, I got this direct from Mountain Hardwear and is in no way Backcountry's fault.

      Backpacking and climbing!

      • Familiarity: I've put it through the wringer

      I have had this pack for about a year and have put it to the test. I have used this pack for more of a climbing pack to carry all of my ropes, cams, harness, shoes, water, etc, and still had quite a bit of room for more. The durability of this pack is incredible. I have accidentally rolled it off the base of Castleton Tower and the back had no tears or frays in the material. I have even had this pack in a complete downpour and the not a thing inside was wet; even in the brain. The hip strap with single buckle is a neat feature as well. Easy to tighten and loosen and the hip cushions are extremely comfortable. The only complaint I have about this pack is that it sags on to my belt and causes them to sag.

      Backpacking and climbing!

      Tom, Currently I have not. It is not because of the carried weight because It has done this with the pack not being fully loaded. It doesnt happen all the time though. Just on occasion like on longer technical approaches, which could have something to do with it.

      Good to summit Baker and Rainier!

      • Familiarity: I've used it several times

      I used this backpack to submit Mt Baker and Mt Rainier and it worked pretty well. I like the option to go full size for the approach to base camp, then reduced size for summit day. I was a bit concerned by the lack of hydration pocket, but I used the back pocket and it worked well (as long as your hydration bladder as the appropriate tube length). The durable nylon fabric looks good and you don't worry to put your bag in dirt mud, rock or ice.

      I left the bag outside the tent each night and no worry to get stuff wet inside. So far I like very much this bag and do recommend it.

      Good to summit Baker and Rainier!

      Well-designed, purpose-built pack

      • Familiarity: I've used it several times

      I looked long and hard before buying this pack- my needs were pretty specific, but surprisingly hard to satisfy. I was looking for a pack that had capacity of 65-80 L to be filled up with winter camping/ski mountaineering gear and get me to a destination, then be stripped down to be used as a summit/day pack. It had to have a good ski carry system, ice axe carry, and crampons holder. Finally, it had to be reasonably lightweight (4 labs MAX!!) and in general be able to withstand the abuses of ski mountaineering (trees, rocks, snow, etc.)

      After spending several weeks looking unsuccessfully, I was preparing myself to go the way of expensive small bag makers like CiloGear, etc... then I came across this bag, which seemed to have been almost tailor-made for my purposes. I've now used it on two, two-day ski mountaineering hut and/or camping trips and it works exactly as advertised! The OutDry system really does work as advertised, as my most recent trip involved lots of rain and a small tent with no vestibule. And the dyneema on the crampons holder is bomber (and can also fit in a pair of ski crampons, nice!) and a nice touch.

      Two minor gripes (but not worthy of removing a star):
      A) crampon holder doesn't close on top. This is basically just an academic gripe, since I've never had an issue where my crampons would fall out (would require the pack to be fully upside down and shaking, in which case you have bigger problems).

      B) There are no other tie loops for attaching a pad, etch to the outside of the pack if you're carrying skis. This has not yet been a problem for me as I've fit everything inside the pack (my preferred way to carry), but if you're up against the limit of what 70L can carry, then it could be a problem for you. Overall, right now, I prefer the clean look without gratuitous features.

      So in summary, great pack for multi-day ski mountaineering trips, one of the only ones I could find built for this purpose, and at a great price too!

      Rookie at the Mountain Hardwear factory!

      • Familiarity: I've used it once or twice and have initial impressions

      We were about to return this pack after my wife kept complaining about the discomfort when she wore it, fortunately I came here to see that it was just the metal wire had been installed the wrong way! Ha! Easiest problem solving ever. And it looks like there's a few other people with this problem...

      Anyhow we haven't put this baby through the wringer yet but from what other people have said this is pretty much the next best thing to one of those Cilo custom packs... For half the price!


      • Familiarity: I've used it once or twice and have initial impressions

      One way to answer this question is to do an "OOPS, I FELL IN THE CREEK" TEST. To simulate this dunking, I filled a laundry tub with six inches of water and placed a 25 pound lead brick in the pack and lowered it into the water. Parts of the pack were submerged to about 8 to 12 inches well above the bottom seams. Each pack was left partially submerged in water for 10 minutes and then removed.

      a. Results of dunking my older, and well-used Mountain Hardwear South Col backpack (my favorite backpack, but not OutDry): After 10 minutes of partial submersion, this older South Col backpack had a pool of water inside. It took up 700 gm of water, enough to fill a 1 liter Nalgene water bottle 2/3 full.

      b. Results of dunking the new OutDry backpacks: There was no visible pool of water inside the South Col OutDry backpack but it felt damp. To measure how much moisture seeped in, several sheets of dry paper towels were weighed and then used to swab the inside of the pack. The paper towels gained about 4 gm, so they had absorbed 4 ml of water. The BMG 105 OutDry backpack is much larger and thus had much more fabric and seams exposed to the dunking. Again no pool of water accumulated in the new BMG 105 OutDry pack. The paper towels used to wipe the inside of this big pack gained 20 g. Conclusion: The OutDry construction is a big improvement, reducing the water uptake by over a factor of 100 in this test (700 ml/4 ml= 175). This is not a perfect test because I do not have an older South Col in new condition to compare with the new OutDry version, although I have treated my old South Col with waterproofing sprays in the past. No backpack is completely waterproof under all weather and exposure conditions. I plan to continue packing my sleeping bag and spare clothing in dry bags.

      I give the OutDry fabric/treatment 5 stars. I am impressed with the new features on both backpacks but reserve a rating of the packs until I have had more experience with them.


      Since my original post, I have run three additional tests of waterproofness on two OutDry backpacks. Calling the above OOPS, I FELL IN THE CREEK the TEST #1, here are the additional three tests and results:

      Test #2. I GOT CAUGHT IN A THUNDER STORM TEST. The set up: The backpack was then placed upright on a plastic box in a home shower and four rain gauges were placed around the corners of the pack. The RAIN was simulated by turning the cold water (18 C). This shower delivered three inches of water in each rain gauge in 5 to 10 minutes after which time the water was shut off. This simulates a severe thunderstorm which is moving rapidly (e.g. high winds), drenching a hiker and moving on. RESULTS: Upon opening the two new OutDry South Col 70 or BMG 105 backpacks, no pools or droplets of water were observed inside and they did not feel damp. To test for moisture inside, sheets of dry paper towels were weighed using a hanging spring scale. The sheets were then used to swab the inside of the backpack and the plastic wastepaper basket inside the pack, and then weighed again. No weight gain was registered. Conclusion: OutDry kept out all the moisture from the main backpack . The inside of the lid (map compartment, which is not OutDry) did feel damp and swabbing with paper towels indicated some moisture (5 to 10 gm) had seeped into the lids of both backpacks. In contrast, my old South Col had small pools of water inside all compartments of the pack (main, front inside pocket, and two inside the lid compartments, est. total water 100 gm).

      Test No. 3 THE DRYSUIT TEST. The set up: taken from a YouTube video "DOGTV Drysuit Leak Test/do-it-yourself By Bob Stinton. The backpack was inverted and placed on a slanted table and 3 gallons of water were poured into the top. RESULTS: Most areas of the OutDry membrane was tight (no leaks) but there were some spots near the bottom of the backpack where water got through to the outside of the inverted pack.

      Test No. 4 THE SOAP BUBBLE TEST. The set up: Similar to leak testing bicycle inner tubes. The inverted pack was placed on a slanted table; an air hose from a Shop-Vac was inserted into the top of the backpack loosely. A soap solution (1 part dishwashing detergent and 4 parts water) was applied to sections of the smooth surface with a paintbrush, and any bubbles were noted. Result: there were a few isolated spots where bubbles formed, probably representing pin holes, but most (99%) of the surface was clear of any leaks.

      CONCLUSION: The results of the RAIN TEST show that the new OutDry material protects the contents of a backpack in a rainstorm. The remaining three tests set a higher standard because it is well known that water penetration increases with pressure. These three tests show that although the OutDry backpacks are a huge improvement, they are not quite perfect. There are some small leaks (pin holes?) present in the two packs tested. The folks at Mountain Hardwear have been very receptive to new information and they are working on eliminating these small defects. My conclusion: The OutDry deserves 5 stars.

      Awesome pack!

      • Familiarity: I've used it several times

      This is an awesome multi-purpose pack. It's designed for multi-day alpine climbing trips. It would make an awesome pack for Mt. Rainier or Aconcogua. It would also be a good all around backpacking pack. The OutDry membrane keeps everything in the pack nice and dry. Great for the Pac NW and the AT. Really comfortable with around 45-50 lbs. Super durable too. Just a really good pack.

      Any tips on fitting the pack to smaller framed individuals? I'm 5'6" male, 18" torso, got the S/M size. It seems that the hip belt always loosens with heavier loads, and I'm constantly re-tightening it. Don't know if this just the nature of the straps or if it is possible to adjust the pack in some way that does not cause the belt to loosen.

      Hey there James!

      Darn that is an annoying problem! Ideally I think an Osprey pack would be awesome for you since we could actually swap to a smaller hip belt for you! You can always try using a rubber band or a hair tie to double over the hip cinch to keep it and the webbing in place! If you want to talk about Osprey more, this mountain hardwear pack or something different you can call me at 801.204.4660 or send me an email to!

      Available Monday-Friday 8am to 4pm Mountain Standard Time!

      How in god's name do you remove the padded hip belt? I've tried just forcing it off the metal frame inside and felt like I was about to tear the bag in half. Any ideas? Or am I just dumb?

      Unanswered Question

      I've been looking at this pack as well as the women's ozonic 58 outdry pack and have seen great reviews on this one but am wondering about the fit for a woman vs a man on this pack. I have a small frame and am concerned this pack may not fit well compared to the other I was looking at. Advice?

      I just purchased the south col 70L and there's this standalone extra strap with buckle that was in the top removable pocket. Been tryingto figure out the use of it. Is it for the top pocket to transform into a daypack? If yes, how would u strap it and what's the purpose of this part here?

      Hey Donovan,

      So thats a replacement waist belt. Lots of alpine packs have this feature so you can strip the pack of extra weight and features for summit pushes. Also a bulky waist belt often will not fit over a climbing harness.


      The weight of a piece of foam padding is negligible in my opinion (but I'm old and tough:) Considering the lower comfort and that you have to carry it to begin with, I consider it a gimmick unless you start with it , or re: the harness issue Pitman notes.

      That strap you touch in the photo is another matter, the larger belt seems to have two, but those are cinches.

      Can this bag carry "Snowboard"?
      I know it can carry "ski".

      Best Answer


      This pack can't carry a solid board vertically or horizontally. But if you have a splitboard and have it in split mode, you can carry it A-frame style like a pair of skis.

      Shoot me an email anytime you have questions!

      Jared D.

      Expert Gearhead


      Of course it can. It looks like it has more than sufficient points where you could attach a couple solid straps, bingo you're in.

      You don't need, "... they say that's what this is for," if you can, "do it yourself." I'd bet anyone I can make a snowboard hang on this.

      I read that the pack does not have any hydration options built in. Is there anywhere I can keep a bottle or bladder in the pack easily accessible without taking the pack off?

      Is there an older version of this pack which is NOT made with OutDry technology? Do all South Col 70 packs made with OutDry have an OutDry label on them?

      Question on fitting the South Col or BMG...

      Question on fitting the South Col or BMG 105 OutDry backpacks: One important aspect of fitting a new backpack is to make sure the stays conform with the lumbar region of the hiker so that the load will be transferred to his/her hips, not the shoulders. The photo below shows a side view of the stays (actually one continuous metal stay bent into a U) of my new South Col OutDry backpack right out of the box. The plastic sheet (visible near the top) goes between the metal rod and the hikers back. The hiker would be on the right. Also in this photo is my template stay that has been bent to shape my lumbar region. Note that the curvatures are opposite. My initial thought is: Has someone at Mountain Hardwear assembled these stays backwards? The BMG 105 OutDry backpack stay came with the same orientation as the South Col. This is easy to correct by unzipping the Velcro strips holding it in place and flipping the stay around before adjusting (bending) it to fit. However, if I attempted to use either of these packs as they were delivered from, the bottom of the U-shaped stay would dig into the top of my lower lumbar, sacrum and coccyx and make for a very painful hike or climb. Am I overlooking something here? Thank you.

      Question on fitting the South Col or BMG...
      Best Answer

      Hayes and Ven,

      You are definitely not overlooking anything and your assessments are spot on. From the picture that Hayes included in the question, it is evident that the pack shipped with the aluminum stay reversed. The lower section of the aluminum stay needs to follow the lumbar curvature of the wearer, as with the template stay that Hayes also pictures.

      It is an easy correction to make, but our sincere apologies for this shipping oversight from our Mountain Hardwear factory. The rectification is to un-hook the lumbar section, slide the stay out of the hipbelt, slide the stay out of the backpanel (easiest to also remove the plastic framesheet) flip the stay around and re-assemble.

      Also remember that part of beauty of this pack is its flexible design, which allows removing pack components (i.e. swap the padded hipbelt for the included webbing belt and/or remove the top pocket, frame stay and/or framesheet when climbing with lighter loads). The minimum weight for this pack is approximately two and a half pounds with these components removed and the hipbelt swapped.


      Alex @ Mountain Hardwear

      I have a question for Mountain Hardware >the photo above showing the U-stay,is it in the correct, or incorrect position.

      My Pack arrived with the U-stay pointing inwards toward my back

      I measured my spine/back and I come in at 21 inches, however the pack seems to ride low on my back ,rubbing the top of my Butt.

      MY U-stay came pointing inwards unlike the photo which seems to be pointing outward, as you can discern from my comment I'm quite confused by the photo and the pack.

      I have not trail tested the pack yet, perhaps it just a situation of me getting used to the new pack.[ Yes,I have adjusted the straps]

      So ...should the U-stay be pointing inward's toward my back ,or outwards .......

      Thank you for your response.


      Hi Stan,

      The "copper"-looking stay that comes with the backpack (it actually anodized aluminum) in the above photo is installed backwards. Mountain Hardwear only shipped a few batches of the incorrectly assembled SouthCol and BMG backpacks and, once they became aware of the problem, quickly corrected it in all future shipments.

      First, check to make sure your backpack is assembled correctly (the reverse of what is showed in this photo). If it isn't correct, you can easily take it out and reverse it. The next step is to adjust the stay if necessary. This is much easier in this new version of the SouthCol because you can take the U-shaped stay completely out of the frame. Before bending it, I suggest viewing some of the youtube videos on how to adjust a backpack stay (e.g. the HPG Ute Internal Frame Backpack Adjustment video]. Then bend the U-shaped stay to fit the lumbar region of your back. What I did was to first purchase from a hardware store a 1/8" x 1/2" flat aluminum piece 3 feet long and shortened the length to 26 inches. I practiced bending it to fit my back before adjusting the actual stay. This inexpensive aluminum rod is now a template for the stays of my backpacks. That is the piece of aluminum you see to the right in the photo above. If you have any additional questions, do not hesitate to ask. Good luck and good climbing! Hayes

      I like the weight, size and the fact that...

      I like the weight, size and the fact that it is waterproof but no place for a water bladder? What are the options for hauling and accessing water on this bag? From the pictures, it doesn't look like there are easily accessible side pockets but it is hard to tell. Thanks.


      A reservoir/bladder may be carried in the floating top pocket or in the front zippered pocket (though the latter is not ideal for weight distribution). Water bottles may also be carried in the top pocket, front zippered pocket and/or front crampon stash pocket (presuming you're not carrying crampons).

      This is a mountaineering pack so Nalgene water bottles are usually carried inside the pack since they tend to freeze at higher elevations if they are outside the pack. Even though it's a mountaineering pack, the reasons you noted (weight, size and the fact that it's waterproof) make it a great backpacking pack as well!

      Alex @ Mountain Hardwear