Really thinking more about a quilt. Per about post #10, a 12"X24" stuff sack? That's about four times the size of my WM 6"X12" (XXS) stuff sack for my Caribou bag. I'm trying to get my volume down enough to eventually get a ZPack pack. Real world, how much will a Revelation X, regular width, 6' length, 30 degree bag stuff down to? I'm a side sleeper at 165 lbs., 6' tall, the 52" width should work for me. Would really like to get the 20 degree quilt, but I need to think summer volume, reduced weight first, so the 30 degree quilt will have to be the one.