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Sphere Bivi

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A good night's sleep that won't weigh you down.

A good night's sleep starts with the proper shelter, such as the Ultralight Bivy Sack from Mammut. The top of the bag is Mammut's ShelterTX fabric and the bottom is made of a slightly more durable EnduranceTX—both are very waterproof and utilize a polyurethane membrane to prevent moisture from getting at you. Extremely lightweight construction (under a pound) and an integrated stuff bag make this bivy easy to always have in your pack, whether it's as your planned sleeping station or an emergency shelter.


  • shelterTX main fabric, enduranceTX bottom fabric
  • Polyurethane waterproof membrane
  • 15K-rated waterproofing/breathability
  • Integrated stuff sack
  • Drawstring opening
  • Item #MAM00QA
shelterTX (polyamide), [bottom fabric] enduranceTX (polyamide), [waterproof membrane] polyurethane
Floor Dimensions
[max use height] 76.7 in
Trail Weight
10.9 oz
Recommended Use
backpacking, backcountry touring
Manufacturer Warranty
2 years