Car Roof Rack Cargo Bags and Luggage Baskets from Thule, Yakima and SportRack mount to your vehicle's roof rack and carry luggage, gear bags, camping equipment, clothing and a lot more. Car roof rack mounted cargo baskets and cargo bags are designed to free-up room in your vehicle - making the ride to and from your outing more comfortable. Roof rack bags are made from a variety of materials and are considered water resistant. Roof rack mounted baskets are constructed with powder-coated steel or aluminum and come in a variety of shapes and sizes. If you don't have a roof rack, you'll need one to attach these cargo accessories.