The Rightline Gear Car Top Duffle Bag is a weatherproof gear bag that you can pack, strap to the roof of your vehicle, transport, and then carry wherever you need to go. Attach (1) to (4) Duffle Bags to vehicles WITH or WITHOUT a roof rack. Each bag comes with a removable shoulder strap that can be stored in the bags zippered side pocket when not in use. The bag is made from tough PVC Coated Mesh that is re-enforced for strength and UV protected. The Car Top Duffle Bag defines travelling efficiency!