Mine has square zippered tops to compartments, not straps. Smaller than the usual backpack size, and it could use some straps or D rings to attach stuff on the outside. Pack is removable from the stool, but the stool is functional with the filled backpack attached. Seat is tiny, but comfortable enough in a pinch. Might want to just use a regular pack and strap a folding stool to it, for the same amount of weight.