Mountain Lab Breathable Bivy Emergency Sleeping Bag



The Mountain Lab Premium Breathable Bivy is waterproof, windproof and—unlike most other emergency blankets and bivvies—is also breathable. This is a huge benefit for anyone who needs to hunker down and stay warm in cold conditions outdoors.

The Mountain Lab Breathable Bivy is constructed of a four-ply material developed by NASA to breathe effectively yet still reflect 70-90% of a person’s body heat. The advanced material is much stronger than a typical lightweight emergency bivy or blanket.

The Breathable Bivy features waterproof seams, a 1/4 side zip for easy entry and a drawstring hood closure to help seal in the heat.


  • Length: 240 cm (94”)
  • Width: 75 cm (30”) at the shoulders
    • 55 cm (22”) at the feet
  • Weight: 190 g (6.7 oz)
  • Packed Size: 16.5 cm (6.5”) long x 10 cm (4”) diameter

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