Free 2-Day Shipping on Orders Over $50* - Limited Time Only


When you're trying to get up, don't have your pack bring you down.

Icy peaks, long mixed routes, and big walls test your physical and mental abilities, but the Osprey Mutant 38 Backpack cleverly complements your alpine ambitions in any season so you don't have to test your patience as well. The Mutant's 38 liters (medium) gives you enough space for a lightweight overnight expedition, but can be trimmed down for ultralight summit attempts thanks to the removable frame sheet and included bivy pad.

  • The top-loading design features a floating top lid and extendable skirt so you can overfill the pack for longer climbs
  • Removable three-fold EVA bivy pad works great for ultralight shelters, but can also give you a pad for gear organization, belaying, or resting on snow
  • Pre-shaped, contoured back panel sheds snow and moisture and fits closely thanks to the removable frame sheet and cushy shoulder straps
  • Includes a sternum strap with emergency whistle and a waist belt that stows around the front of the pack so you can use your harness
  • Gear loops and ice tool loops on the waist belt hold your rack while you approach the route
  • Ice tool (or axe) attachment system holds your devices securely and won't puncture your pack thanks to a gorilla grip patch
  • Spindrift collar on the lid keeps contents snow-free and a rope strap secures your line during the approach and descent
  • Quick-release Z-shaped compression straps condense the load for easy hauling and also provide additional gear attachment points

Share your thoughts

What do you think of the

Osprey Packs Mutant 38 Backpack - 2136-2502cu in

? Share a...

Write a review

No file chosen

Rather attach a photo from another website?

Rather attach a photo from your computer?

    Add a:
  • Share a photo
  • Share a video


Only jpg, jpeg, png, gif or bmp files please.

Submit Cancel
Now review from the App. Download

Here's what others have to say...

So, the picture shows the previous model, is Backcountry still selling the old model, or has the photo just not been updated?

Hey Connor,
This is the Fall/2014 model, unfortunately we don't have the new colorways (Dyno Green and Gritstone Black) in yet!

4 5

The beginner guides pack of choice

  • Gender: Male
  • Familiarity: I've put it through the wringer

I bought this bag about two years ago out of need and the color combination was pretty sweet. After using it on every climbing trip from multipitch to single pitch as well as using it for flights across the country, I wouldn't want to buy any other bag. It's lightweight construction and robust material create an effective combination for its tolerance of abuse, whether its dragging it up three pitches of granite or throwing it in the back of your truck. It holds up to all. The extendable lid makes it easy to accomodate some of your clients gear that they can't fit in theirs. The rope strap and two cinch points inside the pack make for great and simple organization. The helmet and chalk bag fit in the top, under your rope, then your water, food, 4 person medkit and rain shell fit inside the pack with ample room to spare. I've never run into an issue of space when having my harness on, gear slung and the pack on, everything seems to go where it was designed.

Cons: the two little areas on the left and right side of the pack by the compression straps perplex me, because they fit none of the nalgenes that I have, So I end up storing my water inside anyways.

If you want a pack designed to work for you, that outcompetes any other in durability and wow factor, I highly encourage making the decision to improve your life by buying this pack.

Hey Dylan, those pockets on the bottom of the pack are picket pockets. They are designed for alpine climbing/mountaineering where you carry aluminum snow anchors and bamboo wands (to mark the route) on the side of the pack. You're totally right, they won't fit a water bottle but are super useful for keeping your pickets (or wands) neat and attached to your pack.

5 5

A pack to live with

  • Familiarity: I've used it several times

Osprey packs are made for life, and this is one of the better ones. Easy to pack design, with adequate but relatively light protection. I love that this pack is frameless but can still hold 40+ pounds of gear comfortably... probably the only frameless pack I trust to do this.
Only gripe is the color, but it does camo well for stashing...

5 5

super sick

love this pack for a climbing pack. highly adjustable side stratps to tightin down a small load. fits rope and rack and more. although the pad that comes out of the backrest is a pain to get out and is big enough to sit your but on

4 5

Pretty Cool indeed, not epic though.

I don't have that much time with this pack yet, but I'll described my thoughts so far...

Like the capacity, a lot but not huge. Glad I got this size instead of something in the 20-30L range I was originally thinking. It's actually fairly compact until you start expanding the filling the top of the main compartment in the collar. There is a small velcroed pocket inside the main compartment on the backside as well as on the underside of the floating-lid (complete with key leash).

Great details - waistbelt gear rings as well as their fancy biner loops - still learning to take advantage of those. Like the stowable hipbelt, I used this a lot this weekend while wearing my harness. Seems rugged where it needs to be and the materials thought out. LOVE the dual front+rear handles, great for throwing it around.

Wishlist - the removable pad is a cool idea, but unless I'm doing it wrong, it's really hard to get out. Not to mention getting it back in if you don't do it before refilling your bag. Small wish for some external small pocket and/or water bottle storage (I guess I can add a bottle pouch).

Beyond the stuff above, it has enough attachment points outside to temporarily biner stuff on while you move around the rock. The function of the main compartment is as you would expect from any top-loading floating-lid pack.

4 5

Cant Adjust Torso Length

So I have a few other Osprey packs all in size large. The other packs either have an adjustable hipbelt or adjustable shoulder straps (ie moving up and down) and because I am a thick short guy (5'10 190lbs) the larges have always worked for me. Unfortunately I didn't realize this till I got the Mutant in a large and realized that the torso was about an inch or 2 too long for me. Damn. Gonna give the medium a try, maybe i'll have good luck. If not I think I'll hop over to the Variant 37. I have the variant 52 in large for long trips, and it fits great. Holler.

hey there. i'm about your size. but curious as not everyone's torso are the same length even though they are the same height. so i have to ask... what did your torso measure?