Bought 4 sacks, 3 different brands. This is a great sack. The reason this one is cheaper than the others is because it doesn’t have a removable cover. The outer cover is the only cover (other brands have stuffing in a sack, with a zipper so you can add more stuffing) and that sack goes inside the shell. It is made with two zippers. Zipper inside a zipper. Shell feels a little thicker than the other brands, but not as soft. Same amount of stuffing included. Outer shell might be the only real difference.
No washable outer shell might be the main difference