I just got a Kelty Cosmic 20 degree down bag. You can get them for between $80 - $100 online. They are an economic duck down bag. The reviews are really good. I have never had a down bag of any kind; when I got mine in, I took it out of the bag and seriously thought "this is a joke." I shook it a good bit for loft and let it sit for a few minutes. It lofted up good and I climbed in for a few minutes and came out nearly sweating. Weighs in at @ 2lbs, 10oz. depending upon size.