The space emergency bag is manufactured to the same high quality standards as the emergency blanket and reflects and retains over 90% radiated body heat for maximum sedentary protection. use as full body coverage when at rest, inside a sleeping bag, over a sleeping bag to keep out moisture, or in a true emergency situation. when folded it is approximately the size of a billfold, but opens to (36”x84”) 7’x3’ bag. waterproof/windproof and flexible to -40°f. unfolds to 36”x84” and weighs only 4 oz.