Osprey Mutant Nimsdai 90 Mountaineering Pack

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The Mutant Nimsdai 90 was created for Nepalese mountaineer and Osprey Ambassador Nirmal "Nims" Purja MBE and his team for their historic winter ascent of K2. Tested in the harshest environment on one of the world's toughest mountaineering objectives, the Mutant Nimsdai 90 was built to handle superior load carry in a streamlined pack that delivers stability when it matters most and pushes the limits of what and alpinist's pack is capable of. It is constructed with bluesign®-approved fabrics, has a removable top lid, HDPE sheet and hipbelt to shave weight and has lots of options to attach extra gear to the outside.


  • Load range 9-27kg
  • Suspension:
    • 4mm LightWire frame
    • Removable HDPE sheet
    • Two aluminium stays for a V support
    • Removable Atilon sheet laminated to ridged EVA foam
  • Snow-shedding backpanel made with stretch-woven mesh over ridged EVA foam
  • Harness is made with stretch woven mesh over EVA foam
  • Hipbelt:
    • Removable hipbelt for weight reduction or simplicity while wearing a climbing harness
    • Stretch-woven fabric over contoured EVA foam, gear loops and ice gear clip attachment
  • Removable top lid with zip pocket; with FlapJacket™ pack closure when removed and stowaway pocket
  • SR-buckled upper and lower side compression straps for bulky item attachment
  • Two-buckled ice-tool attachment slots
  • Dual deep side wand/snow-picket pockets
  • Removable helmet carry net
  • Front foam-reinforced shield pocket for crampons or snowshoes
  • Dual side ski attachment loops
  • Reinforced gear attachment loops
  • Lightweight, glove friendly buckles
  • Internal hydration reservoir sleeve
  • Two under-lid rope attachments, adjustable webbing strap
  • 3-point haul system using dual front and single rear reinforced haul loops


Capacity 88 Litres (Small-Medium), 90 Litres (Medium-Large)
Dimensions 81 x 42 x 33cm (Small-Medium)
86 x 42 x 33cm (Medium-Large)
Average Weight 2.03kg (Small-Medium), 2.11kg (Medium-Large)
Made From Main: bluesign®-approved 210D recycled nylon grid NanoFly, PFC/PFAS-free DWR
Bottom: bluesign®-approved 600D recycled high tenacity nylon, PFAS-free DWR

bluesign® approved: The bluesign® system is the solution for a sustainable textile production. It eliminates harmful substances right from the beginning of the manufacturing process and sets and controls standards for an environmentally friendly and safe production. This not only ensures that the final textile product meets very stringent consumer safety requirements worldwide but also provides you confidence you'll acquire a sustainable product. Those operating sustainably - meaning conserving resources and reducing the environmental impact to a minimum - also act responsibly and innovatively. Wanting to produce sustainable goods though involves a detailed examination of all materials and processes used as well as the impact of the production on the environment. Only this holistic observation, which starts well before the actual production, will guarantee a final product that is harmless to human beings and the environment. The standard covers 5 principles:

  • Resource productivity: defines the ecological and economical goal to produce textile products of maximum quality and added value, using a minimum amount of resources as well as causing the least possible environmental impact.
  • Air emission: air emissions need to comply with strictly controlled emission limits along the entire production chain. Optimising the energy flow as well as using low-emission components reduces the CO2 load, implicating active climate protection.
  • Occupational health and safety: the health and safety of employees in the textile industry has to be safeguarded by strict guidelines. Weak points occurring locally must be detected. In accordance with the risk potential of the deployed chemical substances, corresponding occupational safety measures are mandatory.
  • Water emission: control aims at feeding back purified water into the natural cycle and causing the least possible pollution of rivers, lakes and seas. This can be achieved by the use of ecologically harmless components as well as by optimising production and wastewater treatment processes.
  • Consumer safety: includes not only the mandate for high-quality textile products without health risks, but also the assurance that all of the principles of sustainability are consistently implemented during the production process.


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