SLEEP IN STYLE...!!!
I Recently took my Western Mountaineering UltraLite 20 degree bag on an early season AT thru-hike. I combined it with a silk liner and slept comfortablly with tempature droping into the teens. When tempatures dropped into the singles and below zero I had to add my space blanket to the mix. It compressed very nice and quickly regained it loft once out of my pack. The full zipper allowed me to use it as a quilt when tempatures warmed up, and the mummy style allowed me to cinche up and trap body heat when it got cold.
The Western Mountaineering UltraLite 20 degree is one of the best bags out there...!!!!