The Thermarest NeoAir is an amazingly light inflatable camp mattress that has a relatively good R rating as well. Its triangular baffles that run from side to side make it stable to sleep on.
The small size makes an ultra-lightweight component for a minimalist sleep system.
Out of the packaging its about the size of a drink bottle:
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The small size which is 51cm wide and 119cm long, weighs 255g. The supplied stuff sack weighs 14g.
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Once inflated, its about 6cm thick and feels very comfortable and surprisingly warm for an air mattress. For the foot portion of my sleep system I use the back protector from my Gossamer Gear Mariposa Plus backpack.
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