Color:Blue Fire
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When the summit is in sight and every ounce counts, customize the alpine-focused Osprey Mutant 38 to make it even lighter and sleeker. It's perfect for quick or multiday ascents in harsh conditions.

  • Features

    • Aluminum stays and an inner framesheet create a lightweight suspension system that handles loads up to 50 lbs.
    • Remove any of the following to reduce weight: top lid, framesheet and aluminum stays, helmet carry, rope attachment strap and side compression straps
    • Removable top lid has an integrated FlapJacket™ below to protect your gear from the elements during the final push
    • Carry your helmet on the top or the front of the pack
    • Reinforced A-frame ski-carry loops work in conjunction with compression/retention straps to provide stable ski carry
    • Side compression straps (lower) and quick-release side compression straps (upper) pull the weight in close
    • Dual ToolLocks\™ with bungee tie-offs provide quick and easy access to your ice tools
    • The padded, EVA foam hipbelt with integrated gear loops and attachment points features reverse-wrap hybrid technology designed specifically for use with climbing harness
    • Rope attachment and internal compression keeps your gear in check
    • Glove-friendly buckles and zipper pulls are easy to operate when your hands are protected
    • Internal hydration sleeve fits up to 3L reservoir (sold separately)
    • 3 reinforced haul loops provide simple, secure 3-point hauling capabilities
    • Front panel daisy chain for additional gear attachment
    • When you set the bag down, the Snowshed fabric backpanel won't get embedded with snow like many mesh backpanels


    View all Osprey Backpacking Packs
  • Technical Specs

    Best Use



    Frame Type

    Internal Frame

    Gear Capacity (L)

    M/L: 38 liters

    S/M: 36 liters

    Gear Capacity (cu. in.)

    M/L: 2,319 cubic inches

    S/M: 2,197 cubic inches


    M/L: 2 lbs. 13 oz.

    S/M: 2 lbs. 11 oz.

    Fits Torso Length (in.)

    M/L: 18-23 inches

    S/M: 16-19 inches

    Fits Waist/Hips

    M/L: 28-50 inches

    S/M: 26-45 inches


    Body: 210-denier nylon; bottom: 420-denier nylon

    Frame Material

    Framesheet with aluminum stays

    Number of Stays


    Reservoir Compatible


    Pack Access


    Number of Exterior Pockets

    1 + main compartment


    29 x 13 x 12 inches



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