Terra nova survival bivi sleeping bag description a great addition to our bivi range the survival bivi is a great value low weight bivi bag it uses a fully waterproof breathable material a simple drawcord closure and packs away into a small stuff sack its great as a normal use bivi bag can be used in conjunction with a tarp or simply kept in your pack every time you go out in case of emergency specifications weight 0340kg packed size 21x11cm product size 215x74cm f