Theres nothing inherently wrong with a space blanket, just what people, users and marketers expect and believe the things can do. How many movies show the couple lost in the woods wrapped like catfish in tin foil and almost as baked? It's akin to all those skinny canvas bedrolls tied off to John Wayne's saddle. A real period bedroll is a monster requiring a pack horse or dedicated wagon <img src="/images/graemlins/blush.gif" alt="" /> Obviously a space blanket in a pocket is better than a Hudson's Bay blanket for carry. It's knowing you have to create that striped classics insulative value with additional resources most people don't understand.