The NEXPOW 15 Cu. Ft. PVC Roof Cargo Bag was designed to withstand extreme weather conditions such as sand, wind, rain, snow and sun. Protecting your luggage from dust, dirt and unwanted bird droppings. The soft shell waterproof luggage bag will protect your cargo and can be folded to fit neatly with all its accessories into the provided storage bag. The straps can easily be attached to your vehicles crossbars or a roof basket for secure transport. The bag can also be secured using the door hooks and/or ratchet straps for vehicles that do not have crossbars. Making this set a truly universal option for cars, vans and measure of protection against theft.