Sherp--great photos--good thinking..i read a good book about a hiker in northern minnesota who sheltered in nothing more than a space like that and survived for a week or so in freezing weather--no fire-left his gear in his tent trying to find where he took a wrong turn and got lost.those may not look like much but with the stuff we talk about carrying--foil bag-bic--so on..you could live in those--