Osprey Mutant 52 -- Your most committing alpine rock and ice pursuits demand a pack that's up for the challenge. The Mutant 52, with its dialed-in features and expansive capacity, is here to answer the call. Tested and developed by local guides and athletes in some of the harshest conditions, the Mutant 52 has evolved into a formidable mountaineering pack for big objectives. If you're planning to spend days in alpine conditions and high elevations, you need the comfort, stability and capabilities of a Mutant. New colors, advanced fabrics and refined features make the latest iteration even more formidable than its predecessor. The whole Mutant family benefits from the addition of lightweight, recycled NanoFly and robic fabrics for impressive durability and lower environmental impact than virgin materials.