In reply to fimm:
If pack size and weight is really the priority then the balloon bed is hard to beat. It does have down sides though.
Pros:
- 100g
- tiny pack size
- actually fairly comfortable
- Provides amusement for other people when you pump it up.
Cons:
- Balloons can only be used once or twice. Using it is not free.
- Can't really be used directly on the ground.
- Only 3/4 length.
- Provides amusement for other people when you pump it up.
http://balloonbed.com/
For me their niche is shortish bothy/camping trips where I know I will have a groundsheet or sleeping platform. My optimistic attempt to use it for Scottish winter did not result in a pleasant nights sleep.