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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


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
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