Aha, that brings up a very important multi-use item. <img src="/forums/images/graemlins/laugh.gif" alt="" />

Body fat...
1. insulation
2. food storage
3. sleeping and sitting pad
4. very personal floatation device
5. arm rest

I'm not overweight. I'm just overly cautious in case one of my day-hikes turns into a 600 mile trek across the Arctic.