Originally Posted by
LeeG
that's a smart idea. Two people under a comforter can be very warm as long as the insulation on the floor is good.
Two large neo air mattresses and a rectangular down bag would weigh 4 1/2 lbs.
The NeoAir at R 2.5 keeps one person at least warm to 25F. Less pricey and warmer (but much heavier) would be the Synmat 7 Deluxe. Cushy! Depends on the trip.