Anyone use the Buffalo bags?
Buffalo Systems Performance Sleeping System
I have the summerweight one, the 'lightweight outer'.
It's very odd. It's thing, and drapes closely around you. The pile is not pleasant against bare skin, too course.
However. This bag never holds damp - not a bit, not even camping outside in a rainstorm. The pile never feels chill, it almost seems to reflect heat. I've camped outside (not in tent) in -5 and was cold, but not frozen. That's the summerweight bag - the winterweight ones are very very bulky and very very warm.
I would rather carry this bag than a bivvi bag for emergency camping. It's mostly been used when hammock-camping and copes with light drizzle so well I never bothered rigging a cover for my hammock.