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Mountain Hardwear BMG™ 105 OutDry Backpack

This pack is GUIDE PICK for Denali, Aconcagua, or any trip where you need to haul more than 75L. Designed for professional guides to comfortably haul heavy loads on long treks. 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.

This pack's clean design makes it easy to manage even when the climb gets tough.  Quick-release ice axe attachment points, gear loops, and easy access zippers are all benefits on a longer expedition.  The BMG's sturdy frame will help keep the weight of an expedition load resting comfortably on your hips.

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This pack is GUIDE PICK for Denali, Aconcagua, or any trip where you need to haul more than 75L. Designed for professional guides to comfortably haul heavy loads on long treks. Flexible design and compression system ensures this pack can…

read more
Specs Sizing
  • OutDry membrane construction main compartment keeps your gear safe and dry
  • Two-part / FitLock, multi-density padded waist belt, with gear loops, built to carry the heaviest loads in comfort
  • HardWave suspension conforms comfortably to the curve of your back and distributes weight evenly but is removable for carrying light loads
  • Multiple lash points and long compression webbing allow for overloads while effectively reducing volume as needed to keep any size load stable
  • 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
  • Intuitive, easy to secure and adjust ice-ax / ice tool carry system with pass through sleeve to conceal picks
  • Super-strong X-Ply Ripstop front panel offers extreme abrasion resistance and tear strength at an incredibly light weight
  • 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
  • Reinforced grab handle ensures safe hauling when needed
  • 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
  • Materials - Body: 400D HD Nylon // Accent: HardWear™ X-Ply Ripstop // Bottom: 840D HT Ballistic Nylon
  • OutDry® Technology: OutDry® is a proprietary construction technology that bonds a waterproof-breathable membrane directly to the shell fabric. 
  • Capacity: S/M - 6400 cu. in. / 105 L  //  M/L - 7020 cu. in. / 115 L
  • Weight: S/M - 4 lb. 11 oz.  //  M/L - 4 lb. 15 oz.

Pack Frame Size
Your correct frame size is found by measuring your torso from the seventh vertebra (the big bump where the shoulder slope meets the neck) down the spine to the point in the small of your back which is horizontally level with the top of your hip bones (iliac crest). To find the iliac crest, use your fingers to trace the hip bone upwards until you can feel the point where the top edge of your hip bones curve inwards, on the side of your hip, creating something of a shelf. Holding your finger on the seventh vertebra, measure down your back to the point in the small of your back level with your iliac crest. The measurement is most easily obtained using a string or a cloth tape and help from a friend. This is your torso length, and using it, you can now select the correct frame size.

Torso Length  
Small/Medium 16-19 in / 41-48 cm
Medium/Large 18.5-22 in / 47-56 cm


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Reviews 43211 4/5 stars based on 6 reviews.


Not a heavy weight contender

It’s mostly a solid pack up to around 65lbs. After that point it is impossible for someone lacking pronounced belly fat to haul the weight over long distances. By 80lbs I could barely climb an hour before my hips were rashed brushed. Had to change to the Gregory Denali to handle that weight.

Use Situation: Mountaineering in the North Cascades and training sessions for Denali.

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Massive, waterproof and stylie.

After summiting Mount Whitney in a blinding snow storm while wearing a vintage Kelty pack, everything I owned got soaked. Needless to say, it was a long cold night at trail camp. I am looking forward to another winter adventure to test out my new pack,this spring on the mountaineers route. Stoked on my new huge waterproof pack! Bring it on!

Use Situation: Backcountry ski and snowboard adventures. And, it keeps all my vintage gear locked and loaded for the next powder day.

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Initial impressions, since I've only worn the pack for a couple of hours with 65lbs. Will give later conclusions after Denali in May. The pack needs to come with better instructions as to use of the various stowed straps, as well as the detachable top pouch. Yeah, OK, maybe if we were all guides we'd already know this stuff. C'mon, Mountain Hardwear, put something useful on your website. The shoulder straps are too narrow for a pack designed to carry big loads. Why don't pack manufacturers get smart and use a wide, stiff, thermosetting plastic layer that can be custom fitted with a heat gun or hair dryer to distribute weight over a larger shoulder area? These straps aren't even replaceable, as they are stitched into the pack. There is lots of room, and I like the fact that the water bottle pockets will accommodate liter bottles with plenty of insulation, but you'll need a buddy to reach 'em unless you take the pack off, or have double-jointed shoulders. Accessory cords, presumably for ice axes, hammers, pickets, etc., seem a bit more complicated than necessary; they have cute little beer bottle openers at the bottom. Really, beer bottle openers? And did I mention the pack needs operating instructions?

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The capacity of this pack is enormous and will be great for Denali. There are lots of pockets and straps for storing and attaching gear. The plastic tubing on the zipper pulls are very helpful for using them with gloves on. However, the waist belt is very stiff and digs into my hips.

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I used this back for a 20 day trip in the Wind River Range in Wyoming. It worked well. The pack fit comfortably (even though I wish I got a large, my torso size is right on the edge.) The hipbelt, even with out doing the fancy molding process, was comfortable. It was very easy to pack, being basically a barrel. It's actually fairly water resistant. After being in a puddle for a half hour in Kentucky on another trip the inside was still dry. No rips or holes even after dragging the beast up rocks. It held 80+ lbs. with relative ease. It also has just enough extra features that I used them all, but didn't want more. On the downside I had a few things brake. One of the buckles attaching the top of the pack to the back of the pack partially broke. One drawstring broke, all though that was partially my yanking on it. Also, one of the ice axe loops broke, though again, that was partially my. Really, my only design complaint was the Ice Loops that we actually metal bars the held the bottom of your ice axe, and a elastic top to secure the handle. The elastic kept slipping making your axe bump around and I would have to fix it every other brake. However, there is a standard ice axe loop that you may use. Overall I really loved this pack. My friends Gregory and Osprey packs failed where mine held up. (Only the NOLS Deuter pack really could compare.)

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