It's amazing how thin some of these bags have gotten. The development of insulation has advanced almost as quickly as the advancement in battery tech. I picked up a couple LaFuma bags. Forget the number right now but they are amazing for the price and size. They aren't overly insulated for cold weather. I think they're 35 degree but they're slightly bigger than can of coke and slightly smaller than a loaf of bread. They're very comfie in 50 degree weather. Weight was an issue when I bought them and I don't need 15 degree bags so these worked perfectly. They're way better than the big roll up ones I had as a kid and those were huge hahaha!