Originally Posted by
Paul_P
I find odd the idea of sleeping directly on the mattress. Seems to me a regular bag with full length zipper can be used just as well as a quilt when open, but you can also have the draft-free warmth when you need it and the comfort of sleeping on something other that rubber.
There are wide or rectangular bags that are much less confining than a mummy.
I've always used a liner in a sleeping bag which can be used by itself and is easy to wash (make them myself and they stay in place with velcro).
I find it very odd when in a mummy or rectangular that lays on top of my thermarest that when I roll or turn, the mattress displaces somewhere into the hinterlands of the tent. My quilt and mattress are connected and my body is on top of the mattress. The insulation of a sleeping bag is so compress under you that it have negligible insulation value anyway.