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This product is no longer available, but don't go just yet.


  • Thermoformed, contoured back panel provides ventilation and moisture resistance for carrying comfort and snow-shedding capability
  • Reverse Wrap ErgoPull hipbelt is easy to adjust with a forward-pull motion; hipbelt can be tucked out of the way when you're wearing a climbing harness
  • Lightweight, removable HDPE framesheet helps stabilize the pack when loaded and folds out into a handy bivy pad when removed fiom the pack
  • Floating lid with spindrift collar and internal/external pockets allows you to increase pack capacity to 48 liters; lid is removable to shed unwanted pounds
  • Internal sleeve and drink tube exit port accommodate a reservoir (sold separately) for hydration on the go
  • Dual tool loops provide lash points for ice axes or other tools; Gorilla Grip patch on the pack fabric resists wear and punctures from sharp tools
  • Hypalon® racking loops on the hipbelt create a durable and unobtrusive gear racking/organization system for climbing equipment
  • Grab handle and 2 reinforced loops at the top of pack create a 3-point haul system for big wall endeavors
  • Z-compression straps cinch down loads for jostle-free carrying and secure skis, poles or sleeping pads
  • The Osprey Mutant 38 pack is made of 420-denier Armourlite and 900-denier Armourguard fabric for light weight and durability


View all Osprey Climbing Packs

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Best Use Climbing
Frame Type Internal
Gear Capacity (L) 35 / 38 / 41 liter
Gear Capacity (cu. in.) 2,136 / 2,319 / 2,502 cubic inches
Fits Torso Less than 18.5 / 18 - 20.5 / 20+ inches
Fits Waist/Hips Less than 31 / 30 - 34 / 33+ inches
Material(s) Nylon/poyester
Frame Material Removable HDPE framesheet/EVA foam bivy pad
Number of Stays 0
Suspended Mesh Back Panel No
Pack Access Top
Number of Exterior Pockets 4 + main compartment
Raincover Included Yes
Dimensions 31 x 14 x 11 inches
Gender Unisex
Weight 2 lbs. 13 oz. / 2 lbs. 15 oz. / 3 lbs. 2 oz.