I just bought a new one from Cabelas, their brand. I prefer rectangular and over sized so I can turn over inside the bag. Since I don't use it for backpacking, weight was not a factor. Rated to -10 and has a canvas/cotton outershell and an oversize zipper. I have a similar bag from Coleman that I bought 45 years ago that finally wore out. Havn't used the new one yet, but will in September.