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The Sphere Bivi is an uncompromising and very lightweight bivouac bag that should be an essential item of equipment on any tour. It is equipped with rope openings, a drawstring and an integrated stuff bag. The upper part consists out of a breathable membrane with a water column of 15,000 mm and a water vapor permeability of M/P 15,000 g/mﾲ/24h. The bottom part consists out of a waterproof nylon fabric with a water column of 5,000 mm.