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Osprey Mutant 38 Backpack

$195.00  $156.00
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The perfect category-killer, Osprey's Mutant 38 is great for long days in the mountains that don't require setting up basecamp but might require some extra gear. Packed with mountaineering-specific features, the Mutant 38 can do pretty much everything you need except belay you on the next pitch. 


  • Form Follows Function: Built to be lightweight and reliable with alpine-specific features such as dual ToolLocks with bungee tie-offs, helmet carry (52L and 38L only), strippable features, rope carry and a narrow profile for efficiency in the mountains.
  • Stripped Weight: Removable top lid (for 52L and 38L only), removable suspension (framesheet on 22L, framesheet and/or dual stays on 38L/52L), and a removable hipbelt on 52L allow the user to trim weight.
  • Fit: Osprey's superior fit makes for efficient and ultimately safer movement in the mountains so that you're never thinking about your pack during runout cruxes through rotten rock or thin ice.
Why is this a Guide Pick?

Kiira Antenucci

My favorite pack is the Osprey Mutant. It is one giant stuff sack that will fit all your gear without too many bells and whistles to get in the way. This pack is for you if you like a clean profile and appreciate simplicity.

Size Chart

S/M        15-18" / 38-46 cm
M/L        18-21" / 46-53 cm

Pack Frame Size
Your correct frame size is found by measuring your torso from the seventh vertebra (the big bump where the shoulder slope meets the neck) down the spine to the point in the small of your back which is horizontally level with the top of your hip bones (iliac crest). To find the iliac crest, use your fingers to trace the hip bone upwards until you can feel the point where the top edge of your hip bones curve inwards, on the side of your hip, creating something of a shelf. Holding your finger on the seventh vertebra, measure down your back to the point in the small of your back level with your iliac crest. The measurement is most easily obtained using a string or a cloth tape and help from a friend. This is your torso length, and using it, you can now select the correct frame size.

Product Details

10 - 40 lbs.

S/M2197 cu. in/36 L26.8H X 12.6W X 11.8D IN.2.7 lbs
M/L2319 cu. in/38 L28.7H X 12.6W X 11.8D IN.2.8 lbs


  • Snowshed fabric backpanel
  • Dual ToolLocks with bungee tie-offs
  • Front panel daisy chain for additional gear attachment
  • Three-point haul system
  • Internal hydration sleeve
  • Glove-friendly buckles
  • Rope attachment and internal compression
  • Removable top lid with integraged FlapJacket for lidless use
  • Top or front of pack helmet carry
  • Reinforced A-frame ski carry
  • Quick release upper side compression straps
  • Lower side compression straps
  • Dual hipbelt gear loops and ice gear carry attachment
  • Reverse-wrap hipbelt
Mutant 38 Backpack

Mutant 38 Backpack

$195.00  $156.00

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