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BMG™ 105 OutDry Backpack


https://www.mountainhardwear.com/bmg-105-outdry-backpack-OU5956.html OU5956


Designed for professional guides to comfortably haul heavy loads on long-trek peaks like Denali and Aconcagua. Flexible design and compression system ensures this pack can grow-or shrink-according to your needs. OutDry construction bonds a durable waterproof membrane to the main compartment so that your gear stays safe and dry in even the wettest conditions.
Style# 1539831


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    • M/L
    Sizing: True to Size

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Features & Specs

  • Waterproof Technology - -
  • Weight: - 4 lb 12.1 oz / 2158 g
    4 lb 13.5 oz / 2198 g -
  • Reviewers rated this product: - True to Size -
  • Pack Capacity: - 6400 cu in / 105 ltr
    7020 cu in / 115 ltr -
  • Good For: - Alpine Climbing -
  • Good For: - Backpacking / Hiking -


Designed for professional guides to comfortably haul heavy loads on long-trek peaks like Denali and Aconcagua. Flexible design and compression system ensures this pack can grow-or shrink-according to your needs. OutDry construction bonds a durable waterproof membrane to the main compartment so that your gear stays safe and dry in even the wettest conditions.


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  • Guaranteed watertight OutDry® construction main compartment, rain room tested for 24 hours
  • Two-part / FitLock, multi-density padded waist belt, with gear loops, built to carry the heaviest loads in comfort
  • Multiple lash points and long compression webbing allow for overloads while effectively reducing volume as needed to keep any size load stable
  • HardWave suspension conforms comfortably to the curve of your back and distributes weight evenly but is removable for carrying light loads
  • Large zippered front pocket allows storage of frequently needed items or tools and maintains volume even when main compartment is full
  • Easy access crampon stash pocket
  • Super-strong X-Ply Ripstop front panel offers extreme abrasion resistance and tear strength at an incredibly light weight
  • Intuitive, easy to secure and adjust ice-ax / ice tool carry system with pass through sleeve to conceal picks
  • Flexible design concept allows removing or adding pack components for optimal versatility
  • Great load transfer through an aluminum perimeter stay that locks into hipbelt while allowing slight pivoting
  • Additional removable horizontal stay in lower pack creates a more rigid frame for more efficient load transfer to carry heavy loads comfortably
  • Dual-density shoulder straps carry in comfort
  • Removable top pocket with zippered security pocket inside for valuables
  • Deep wand or picket pockets with hook and loop closure
  • Lower webbing accessory straps double as compression for lower pack
  • Reinforced web haul loops on lower sides of backpanel for pulling sleds or pulks
  • Reinforced gear loops on lower sides of pack offer clip points for climbing gear or carrying skis A-frame


  • Fabric Accent: HardWear X-Ply Ripstop
  • Fabric Body: 400D HD Nylon (100% Nylon)
  • Fabric Bottom: 840D HT Ballistic Nylon


  • Pack Weight S/M: 4 lb 12.1 oz / 2158 g
  • Pack Weight M/L: 4 lb 13.5 oz / 2198 g
  • Pack Capacity S/M: 6400 cu in / 105 ltr
  • Pack Capacity M/L: 7020 cu in / 115 ltr
  • Pack Dimensions S/M: 37 in x 16 in x 15 in / 93 cm x 41 cm x 37 cm
  • Pack Dimensions M/L: 39 in x 16 in x 15 in / 98 cm x 41 cm x 38 cm
  • Pack Torso S/M: 16 in - 19 in / 41 cm - 48 cm
  • Pack Torso M/L: 19 in - 22 in / 47 cm - 56 cm
  • Pack Waist S/M: 28 in - 34 in / 71 cm - 86 cm
  • Pack Waist M/L: 33 in - 39 in / 84 cm - 99 cm


BMG™ 105 OutDry Backpack is rated 4.0 out of 5 by 13.
Rated 3 out of 5 by from Not very sturdy material After one usage, in water elements to take advantage of the dry bag function, the pack suffered a tear at the base of the bag. This was extremely frustrating as there was exposure to water for the remainder of the trip. The bag was not overloaded nor carrying too much weight to result in such a tear. Very frustrating.
Date published: 2018-08-15
Rated 4 out of 5 by from Great expedition pack The BMG 105 handles heavy loads better than any expedition sized pack I’ve used so far. Being a tall and skinny person, the medium / large size fits my length well but the hip belt is nearly maxed out when I’m not wearing many layers. After one year of use the frame somehow broke in half, which was disappointing and seemed odd for such a large pack. but Mountain Hardware replaced it, no questions asked. I wish the side pockets were a bit bigger (deeper) to better hold pickets. It can be difficult to get multiple pickets in those tight side pockets when carrying a full load. I like the large zippered pocket which allows separation of dry and wet gear or allows access to bigger items you may not want to bury(first aid, hat/ goggs, repair etc ...) crampon pocket is very helpful , and helps protect other gear. This is a simple mountaineering expedition pack that works well for heavy loads and winter expeditions.
Date published: 2017-10-18
Rated 3 out of 5 by from Horrible Hipbelt, great pack overall Been using this pack for Aconcagua (am 6'2", 200lb, and use a M/L), and its design and function is really great, well thought out, and service from MH was amazing. That said: the hipbelt is a travesty. I cut a piece of blue foam mat to run through the hipbelt to give some extra padding---otherwise it's like 2 tiny toddler arms wrapping halfway around your hips and pinching hard. They need to be a little wider, a little longer, and a little thicker. The shoulder straps are great, the pack is waterproof (but could maybe use a side access zipper), stowage, etc., are all amazing. Let me reiterate: the hip belt is really bad. I'd be really excited if MH came out with a hipbelt replacement for it---I would even pay for it. Yes, I would recommend this product, but I would do so if you have a good hipbelt replacement option---and it'd be nice if one side of the hipbelt had a zipper pocket, and the "picket pockets' on the sides were large enough for a water bottle. This pack is almost there---almost
Date published: 2016-11-09
Rated 5 out of 5 by from Big hauler Bought this specifically for Denali and it worked perfectly. For a pretty lightweight pack it carries loads well and MH has engineered this pack with reinforced loops (carry and waist) so you can attach your pack tether and sled sling directly to them without extra looping through other parts of the pack. Only problem was the male waist buckle broke, luckily I was able to get another one on the mountain, phew... I'm 5'8", 165# and the pack fit fine.
Date published: 2016-06-14
Rated 5 out of 5 by from Simply Excellent as a large pack. I have both the current pack in m/l size and the former rendition in m. These are superb packs that can carry very heavy loads. I have had this pack to the summit of Denali which was a 3 week climb and it performed flawlessly. Those were loads up to 80 pounds and I trained with loads up to 100. That's a LOT of weight! With several extended trips in rugged country under the belt, This pack has yet to exhibit a single flaw. Stitching, materials, function, buckles, pulls, zippers etc. are all functioning at 100%. This pack is worth every penny. Cons: There is a steel bar that runs up the spine area of the pack for support I have had to bend back into shape a few times. Just put hand on bar and push hard. That's it for issues. Highly recommended.
Date published: 2016-04-08
Rated 5 out of 5 by from Love it! Everyone's commenting on how awesome my new backpack is.
Date published: 2016-01-07
Rated 4 out of 5 by from BMG back pack I love this bag it perfect for my self. It holds a lot while being very well centered in my core making it easy to move effectively.
Date published: 2015-11-25
Rated 4 out of 5 by from Denali Prep Used this for a Denali Prep Course on Mount Baker. Truly is waterproof, shed both rain and snow extremely well, attachment points for sled rigging made things very convenient, plenty of room to haul everything you'll need for a longer expedition. The only fault I have with waterproof packs is if you aren't careful in a rain storm and rain manages to get in...it will not get out.
Date published: 2015-09-27
Rated 2 out of 5 by from Tries to be too many things to too many people I'm torn over how to comment on this pack. I want to like it but find it hard to do so. It’s a large pack and Mountain Hardwear has tried to make it appealing to the enthusiast market as well as the novice pack buyer. The pack does hold tons of gear but when it comes to the details, it gets almost everything wrong. I'm an avid climber and treker and so my feedback is based on my experience across other competing packs and what I've found while using my BMG: Stuff is sown all over the place - The pack has a surprising number of gear loops, attachment points, straps, clips, whistle, loops, buckles etc. This totally defeats the approach of having a clean and self contained bag but impresses buyers who are new to backpacking who think that kind of stuff is nice. You can hang multiple cups, poles, axes, crampons, a camera, you can strap on sleeping pads and bags all over the outside. The opposite of what experienced hikers are looking for. My friends and I began to joke that I could maybe shave a couple pounds off the pack weight just by cutting off all the extra stuff that this bag has sown all over its exterior. Gear hanging loops on waist, shoulders, sides, top sides etc..... - enough said. Silly pockets in top section and crampon pouch area - the top section is effectively unusable when the pack is full because it is crushed down, and the extra zippered pouch inside the top pouch is redundant. Then adding 4 more gear attachment loops all over the already floppy top is useless. The crampon pouch area is an enigma. Why they have chosen to put a second zippered pouch underneath the already strapped down outer pouch such that you cannot use the zippered one when anything is in the strapped outer pouch is a mystery. Additionally, my crampons cut through and punctured the pouch on first use, and my crampons are not particularly sharp. Velcro on side pockets - I really dislike this feature. I actually cut mine off to lose the weight. Nothing fits in them when the pack is full anyway, the Velcro is impossible to open in the field, it prevented me from storing wands and pickets in the side pockets. Outdry - my friends began to joke that they should have called it 'Inwet'. Any moisture that gets into the bag via blowing snow or comes in on your gear just stays locked inside, additionally, after a day or so of gentle rain or snow, the pack would be soaked through and through, particularly prone to this is the underside of the top pouch. Shoulder and waist straps - woefully insufficient for anything over 70 lbs. Overall sloppiness - the bag is so large that unless you keep it pretty full, the myriad of straps and buckles is ineffective at compressing the bag down into something that doesn't just flap in the wind. Axe loop - the axe stowage system is annoying. Of all the dozens of extra superfluous stuff sown onto the outside of this pack, you couldn't give me a simple axe loop? Instead I have a heavy, complicated and messy tuck away system....Madness.... Fit is poor - as many people have commented on various gear reviews, the sizing is problematic. The s/m is too small for me and the m/l is too big. I do the best I can with my m/l but it’s not a very comfortable pack. My overall impression is that this pack is best used by somebody just out of college doing a hiking tour through Europe, going from hostel to hostel. The pack does collapse down well so that you can actually pack it inside of your check luggage. It does hold a ton of gear. However, the pack simply doesn't perform as a backcountry backpack as its way too sloppy with straps and accessories all over the exterior that flap in the wind or get caught on stuff, in addition to the point that the straps are insufficient to support an actual heavy load.
Date published: 2015-03-26
Rated 5 out of 5 by from Great backpack I haven't been hiking in awhile and purchased this bag, I thought It would hurt a little until I broke it in but it was very comfortable.
Date published: 2015-02-26
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