CWM

This bag rocks! It is the warmest bag I have ever owned. There is ample room in the foot box so you can wear your boot liners or booties at night. I bought two of them last year. One was new and one had been washed once. The new one was a little warmer but both of them kept us warm at 30F below zero all night long. Very light and will compress down to almost nothing. I think it's to much bag if the temp is above zero. It's gonna cost a little but well worth it

I have used this bag on many trips over the last 6 years from the Great Lakes Region to most recently Mt. Adams in the Presidential Range. However, I have not had it out in cold enough temps to truly evaluate it at it's comfort minimum. It has seen multiple uses around and somewhat below zero and as low as approximately -15F. My thermometer didn't go below -10F, but the -15F is suggested because that night was colder than previous nights on the same trip that bottomed the thermometer at -10F. In all cases I had to unzip it a little bit to cool off. It is the warmest bag i have ever used, including other bags with similar comfort ratings which were horribly optimistic.

The DryLoft shell allows easy removal of condensation frost and keeps the insulation nice and dry. I also like how the hood cinches around my head and face, allowing me to leave a little breathing hole.

The bag lofts to just over 10 inches and measures the same (as of last week when i was re-checking it) as when i bought it 6 years ago. It regains full loft from compression in a reasonable time. I store it completely lofted in a warm, dry place.

I have the Regular length (I'm 5' 11") and it has sufficient room in the reinforced footbox for boot liners or misc. clothes (i usually put clothing under me and boot liners in the foot section). I use a VBL and this system has worked very well for me. It is a large bag, but with some home-made compression straps added to the sleeping bag compartment in my pack, it compresses nicely.