Designed by guides and athletes, the Mutant 38 fits perfectly between its bigger and smaller siblings; great for long days in the mountains that don't require setting up basecamp but might require a ledge-bound shiver-bivy. The backpanel sheds snow and easy-to-use ice tool attachment and glove-friendly buckles mean less time fiddling with your pack.
With a hipbelt that includes gear loops and stashes behind the pack to provide access to your harness when you need it, plus integrated helmet and rope carry, the Mutant 38 is a nimble and capable alpine machine that fits better and feels more comfortable than what you’re used to. Whether you're enjoying a North Cascade's classic or getting showered by spindrift in the Canadian Rockies, the Mutant 38 can do everything you need except belay you on the next pitch.
- 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 integrated 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
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.
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.
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.
Having a comfortable pack can be a make or break for your trip. No matter if you're carrying 18kg on a multi-day expedition, or just an extra layer and lunch on a short hill day. Fitting your pack properly takes a little time. But we promise it'll be time well spent.
In this guide, we'll look at how to measure your back length and how to fit your pack.
How to measure your back length
You'll need a tape measure and a friend to help you out with this.
- Place your hands on your hips and tilt your head forwards.
- Ask your friend to measure from the bony bit at the back of your neck (the C7 vertebrae) to where your hands sit on your hips.
- This measurement will give you an idea of which back length to choose.
Fitting your pack in 6 steps
- Loosen all the straps.
- Add a little weight into the pack. 3-4 kilos will do it.
- Put the backpack on your shoulders and do up the hip belt. This should sit over your hip bone.
- Check that the pack is sitting well over your shoulders. It should follow the contour of your upper back. If the hip belt is sitting above your hip or pulling down your shoulders, you'll need to lengthen the back. If it is below your hips or really loose over your shoulders, then shorten the back length.
- Once you're happy with the back length, whilst wearing the pack, tighten the shoulder harness so it is just tight enough. If you grab the straps and pull down and back, your hands should not usually pass your waist.
- Make sure the sternum (chest) strap is in the right place for you and clip together. This should only be 'finger-tight'.
And you're good to go.
It's also a good idea to go through these steps every so often to make sure your pack still fits you well.
If you have any questions our pack fitting experts are always here to help
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