MobileGear Automotive- Classic Roof Cargo Pack (Pre-Owned), 13.5 ft of space. This listing is for one roof cargo pack that can be strapped to the top of an automobile. This item has been used before. It has 13.5 cubic feet of space and can be attached to roof racks with straps or snap-clips. It is weatherproof, can be fully taped at the seams, and is closed with a zipper. When not in use, it can be folded up into a compact size.