shelter warmth

Emergency Bivvy Sack

The Emergency Bivvy Sack is an ultra-compact, reusable sleeping bag cover made from heat-reflective aerospace-grade material. It retains up to 90% of your body heat, protecting against hypothermia in extreme cold and wet conditions. Unlike single-use mylar blankets, this bivvy is durable enough for repeated use and is large enough to fully enclose an adult. Packs to the size of a tennis ball—essential for any bug-out bag, hiking kit, or emergency cache.