Keep one in the trunk of your car for the unexpected!Bivvy bags effectively retain 90% of heat, providing insulation in survival situations. Outdoor EssentialsOne side has the functions of rainproof, fireproof, dustproof and soil, and the other side can be used to reflect heat, form a radiation barrier or send out a distress signal.The close-to-natural color and insulation can be used to deceive animals, and good shielding can reduce radiation and signal interference.
eBay