text: 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.