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Osprey Packs Mutant 52L Backpack


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Mutant 52L Backpack

For big objectives and epic missions, the Mutant 52L Backpack is the pack to take along with you when you're planning on moving light and fast. Osprey slimmed down this pack so it only has the necessary bells and whistles to accommodate the tools you need to get the job done while playing in the high mountains. The large volume provides enough space so you're able to hike all your gear in to set up basecamp, and still sneak in a couple extra luxuries of home. Gear loops on the removable waist belt add access to extra gear when you're on the move, and a three-point haul attachment evenly distributes the weight of the pack so it can be stored at an anchor and hauled up a pitch when the climbing gets technical. Additional helmet and ice tool carry means that you can store your gear safely and securely on the way back to the car.

  • A backpack for light and fast missions that could span multiple days
  • 52 liter capacity carries the necessities and extras so you're prepared
  • A-frame ski carry system hauls skis securely while ski mountaineering
  • 3-point haul attachments distribute weight evenly for hauling up climbs
  • Gear loops on waist belt allow for additional gear storage and access
  • Ice tool carry points safely haul ice tools on the approach
  • Helmet carry attachment stows helmet during the hike back to the car
  • Removable waist belt shaves weight when counting grams
  • Item #OSP00BB

[main & accent] 210D nylon, [bottom] 420D nylon
[small/medium] 50L (3051cu in), [medium/large] 52L (3173cu in)
removable atilon sheet lamination, HDPE top stay
Shoulder Straps
laminated EVA
Waist Belt
Hydration Compatible
2 zippered lid
Gear Loops
1 front panel daisy chain, 2 waist belt gear loops
Helmet Carry
Ice Axe Carry
Weight Capacity
29 x 13 x 13in
Claimed Weight
[small/medium] 3lb 3.8oz, [medium/large] 3lb 6.6oz
Recommended Use
ice climbing, mountaineering, sport climbing, trad climbing
Manufacturer Warranty

Tech Specs

What do you think about this product?


>Rating: 5

Love it for cragging

I've put it through the wringer
Size Bought
6` 1"
180 lbs

I don’t alpine climb but I bought this pack because of all the features and they all actually held up. I can throw my whole rack in my bag with a 70m rope on top and it comfortable with all the adjustments to the pack and I only have the 38L. With sport climbing I use the ice axe straps to hold my extendable stick clip. Another bonus with it being a alpine pack it’s pretty water proof. I got stuck in a couple of thunderstorms over a weekend and everything was soaked except what was in my pack. My rope and gear were dry inside. My only request would be for the rain top to be removable for lighter treks and easier access. Other than that 10/10 would recommend for and climber alpine or not

>Rating: 5

Excellent mid-range mountain pack

I've used it several times
True to size
Size Bought
5` 11"
190 lbs

I bought this pack AFTER I'd purchased its smaller sibling the Mutant 38. I was so impressed by how focused the pack was on durability and purpose. The shoulder straps feel great once the pack has weight in it, the hip belt with loops is really useful, especially if you're moving with a lot of gear or need to hook a water bottle somewhere. I like that the 52 has "picket pockets" that you can use to hold anything from tent poles to pickets. I initially bought the 38 for shorter trips into the rockies with a day's worth of climbing gear and supplies but as time went by my objective became more time-intensive so I bought the 52 to carry 3 days of food and supplies along with my trad kit. I do appreciate that you can strip the pack down, although if you're going up on a rope I don't think I'd strip the pack down and use it on climbing routes unless you're moving for days on end, such as completing a cirque or traversing a range. If you're on a single day trad route, I'd bring a much smaller pack like a cotopaxi luzon that would double as a stuff sack. I like that the pack keeps the weight centered, how narrow it is at your hips to accommodate a harness, and how durable it is. I plan on using the 38 in the Rockies but the 52 is part of my kit for a longer trip in Gates of the Arctic that will keep me away from our base camp for 3-4 days at a time. My only suggestion is to include shock cord or something elastic on the front of the pack. I see a lot of people talk about avy gear and it makes sense to have a pack that lets you carry a shovel, but this is a climbing and mountaineering pack and something to secure crampons with would be a way better addition than a place for a shovel. Just my thoughts.

>Rating: 4

Very good climbing pack

I've used it several times

I've used the Mutant 52 on two overnight climbs so far, the Cooper Spur on Mount Hood and the standard Rainier DC route. On both climbs the pack performed very well - it was just the right size for lightweight overnight gear plus the standard sharp stuff, is relatively light, carried very comfortable, is relatively weather-resistant, provided a stable carry, and was as comfortable as any pack I've used for climbing. I initially thought the helmet carry was a gimmick, but in practice it proved useful. So why only four stars? I'd suggest Osprey consider a few modifications: (1) the dark blue color is not conducive to searching for gear in the pack (I prefer bright colors for a climbing pack), (2) the lid straps interfere somewhat with the ice axe handle attachments, and (3) removing the lid and using only the "flap jack" exposes the hydration hose exit hole to the heavens (I have no use for hydration bladder compatibility on an alpine climbing pack anyway, so removing it and plugging the hole would reduce the weight even further). Would I buy it again? Probably because of the comfortable and stable carry. But it would be a no brainer if the suggestions listed above were incorporated.

Thank you Kirk! Great feedback! Leta Osprey Rep

>Rating: 5

Fantastic climbing pack

I've used it several times

I love this thing but read one for two complaints. If you are looking for a great pack for climbing, mountaineering, or the backcountry in the 50L category this is one of the best. It has enough features but not too many. It holds skis or a split board (in the A frame config) very well, plus it has nice ice axe holders, a helmet net, and the ability to strip it down to lighten it up for the summit push. The ONLY thing I wish it had was a proper avy pocket (for shovel and probe) on the front for quick access and I wish it has back panel access. I found I can do without it but those would have made this the perfect pack. If you need those features check out the Mammut Trion series. I didn't go with those as some of their other features I did not love. All in all I am very happy with the Osprey Mutant.

Thank you for the feedback Winston! Leta Osprey Rep