Surprised nobody mentioned quilts? I bought a Hammock Gear quilt bag last year and it's one of the best purchases I've ever made. They save some weight by not having a zipper and baffles like a mummy. I bought it for two purposes: I move around a lot and just don't sleep well in a mummy, and to save weight. You do need an insulated pad but you really need on no matter what bag you use. Mine weighs 21.3 oz as I bought a 20 degree bag in the long option, with 2 extra oz of down (850). After my research, I felt that HG gave you the best value for the $ with a higher quality down. As noted, this is one of my best moves ever as I slept much better and never got cold. Some nights were around 20 degrees this year so I think their temp rating is true relative to comfort level vs a survival temp rating! I typically sleep in a baselayer just so I don't have to put it on in a cold tent and I'm sure that also helps a bit on the warmth!