Inflatable Space Blanket: I applaud this chap’s ingenuity. I have purchased two space blankets and some ‘Gel Grip’ contact adhesive (works well on mylar) and a baby food juice container for the valve and intend (time permitting) to construct an inflatable space blanket which should weigh about 120 grams and help one survive down to sub-zero temperatures providing you can construct some ground insulation (Neoair or pile of ferns, grass leaves, etc): http://www.instructables.com/id/Survive-without-style-the-ultimate-garbage-bag-she/
The Ultralight Hiker
Ultralight hiking, backpacking, bushwalking, deer hunting, canoeing, pack rafting, tips, trails, adventures, gear, reviews...Over 1600 posts & 70 years' experience.