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Light, strong, and stoic, Osprey’s Mutant 28 is a perfect partner on your next high alpine adventure.

This bucket-style top-loading pack has a featherweight aluminum suspension system that handles loads up to 40 pounds. The mesh Airscape™ backpanel provides ventilation and all-day carrying comfort.

When the summit is in sight and every ounce counts, shed weight by removing the pack’s suspension, compression straps, and the helmet carry sling.

Other alpine-specific features include A-frame ski carry loops, dual ToolLocks™ with bungee tool tie-offs, and front panel webbing loops for crampon attachment. It also has an interior mesh slash pocket to keep small items organized. All zipper pulls and buckles are glove-friendly to keep your hands protected while grabbing for gear in frosty temps. And the hipbelt has built-in gear loops so you can to keep a few pieces handy to build a quick belay anchor and safely bring your partner up the final Class 4 scramble to the summit.

Key Attributes

Stripped Weight

The top-lid with integrated FlapJacket™ system*, framesheet and aluminum stay, helmet carry, rope attachment strap and side compression straps are all removable to optimize weight savings. *Mutant 38 only

Reverse Wrap Hipbelt

The unique hipbelt system allows the users to wrap the padded hipbelt out of the way of the climbing harness.

Key Climbing Features

Dual ToolLocks™ with bungee tie-offs for quick and easy access to your ice tools. Reinforced A-frame ski carry loops work in conjunction with compression/retention straps to provide stable ski carry.

Additional Features

  • Large Zippered Top Access - Zippered, wide mouth bucket load top access provides easy access to the pack’s internal contents
  • Interior Slash Pocket - Interior mesh slash pocket keeps smaller gear organized
  • Minimal Padded Hipbelt Wings - Minimal padded hipbelt wings include gear loops for quick rigging
  • Rope Compression - Integrated rope compression strap keeps your cord secure

Carry Information

Aluminum/HDPE Suspension

  • Removable aluminum stay and 1.2mm HDPE frame sheet

Reverse Spacer Mesh Airscape Backpanel

  • Smooth breathable surface over ventilated ridged foam

Reverse Spacer Mesh Harness

  • Smooth breathable surface die cut foam
  • Webbing attachment points and reservoir hose routing
  • Adjustable sternum strap with whistle

Padded EVA Hipbelt

  • Reverse wrap hipbelt padding wings with gear loop and attachment points (38l)
  • Minimal padded hipwings with gear loops (28l)


Load Range
25 - 40 lbs.
12 - 18 kg
  Volume Dimensions Weight
S/M 1587 in3 / 26 l 23h x 11w x 10d in. 2.05 lbs.
M/L 1709 in3 / 28 l 24h x 12w x 10d in. 2.16 lbs.
S/M 1587 in3 / 26 l 59h x 29w x 25d cm 0.93 kg
M/L 1709 in3 / 28 l 61h x 30w x 25d cm 0.98 kg
210D Nylon Dobby
210D Nylon Triple Ripstop
210D Nylon Triple Ripstop
Product Manual Additional languages available here �


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MUTANT 28 depicted in image
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Side Compression

Adjustable, removable one piece side compression/retention straps with upper side quick release buckles provides load stability and external carry options

A-frame Ski Carry

Reinforced A-frame ski carry loops work in conjunction with compression/retention straps to provide stable A-frame ski carry

Helmet Carry

Stowable, removable stretch mesh helmet carry system provides stable carry of helmet when not in use

Ice Tool Attachment

Dual ToolLocks™ work in conjunction with bungee tool tie-offs to provide secure and easily accessible ice tool carry

Webbing Attachment Points

Multiple front panel webbing loops provide ideal attachment points for crampons and other needed gear
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Pretty Good Bag


This bag was so great when I first got it. Amazing for holding ice gear and loved it for multi pitches or days at the crag. As long as I didn't have to open the bag too often. I was super disappointed that the top zipper keeps snagging and it's rrally difficult to open. The pull tab keeps falling off which makes this more challenging. I requested a new tab and got it promptly because the last one fell out. Now I have the tab and have tried closing the gap so it is smaller but some way it still manages to come out. I like that it's a big sac style bag to get my things easily, just wish that it was easier to get into the actual bag. I stopped using it for hiking because it became frustrating every time I wanted to get in the bag.

Calgary, Alberta




An excellent sport climbing pack, big enough to hold all of the gear, clothes and food for a day at the crag. Then just use the rope cinch on the top and you are all set!

Charlotte, NC


Fully Featured for Climbing Endeavors


I've used the past and current generation of the Osprey Mutant and this is my favorite. This pack is always with me on ice climbing trips or when I'm visiting a sport climbing crag. It'll hold what you need it to, and the rope/helmet carry system works great. The "reverse bucket" opening makes loading bigger items like a rope or light trad rack easy. The pack carries well with lighter loads and does a reasonable job when you push the load limits. I do find it necessary to buckle the hipbelt behind the pack when wearing a harness. The ice tool attachment system, while fantastic for almost all tools, is a bit spotty if you have a larger gap in the head of your ice tool. Overall, a great pack that I use through all seasons.

Cortez, CO



4.0 3


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