REI Kilo Plus -5

I have the men's version (gold and grey color). Awesome bag! Snug as a bug in a rug!

I have the men's version of this bag, bought it in 2002 I think. The thing rocks! Its shell is water resistant (always a good thing with a down bag), and while there's higher fill-power bags out there, for the price you will have to look hard to find a better value in a sub-zero bag. 

I have taken this bag out in zero degree temps in Shenandoah National Park, sleeping in an open-sided shelter with wind-blown snow hitting me all night... and I stayed toasty warm with just a base layer on. It is SUPER silky-soft on the inside, yet durable. Packs down small.

The draft collar, tube, and hood are nice and thick — no drafts. And there's a micro-fleece layer around the hood area for your face. Plus nice touches like the hood/collar pull cords are different by touch and visual, so no fumbling around when trying to adjust in the dark.