The ARK Emergency Bivi is the ideal lightweight bivi bag for emergency situations.
Made with lightweight PE (Polyethylene), the ARK Emergency Bivi bag is wind and waterproof and reflects body heat. Super packable, folding down 12 x 6 cm in its stuff sack, and lightweight at 105g, the ARK Emergency Bivi bag is an essential emergency mountain product.
Also check out the Rab Ark 2 Person Bivi.