The Rear Car Clips attach to the side straps of the patented Car Back Carrier, (formerly Cargo Saddlebag) allowing you to use your bag on vehicles WITHOUT a roof rack. Many of today's vehicles are produced with low profile side rails, no cross bars or without roof racks altogether; the Rear Car Clips let you enjoy the use of a great product without having to install roof racks, rails, baskets, or other expensive alternate solutions.