What Makes PI Store Rooftop Cargo Carrier Bag Our Trusted Choice? LARGE STORAGEOur Car Rooftop Carrier provides an extra 16 cubic feet of space, offering another trunk space to your vehicle for road trip travels. The Cargo Bag is ideal for family trips, camping, adventures and anywhere extra roof storage is needed on the car top for suitcases, luggages, tents and sleeping bags SECURE FIT4 sturdy, heavy duty straps can always secure your rooftop carrier bag. A free antislip mat keeps the cargo bag in place even at highspeeds, protecting car roofs from scratches and damage WEATHER PROOFThe waterproof Cartop Carrier keeps your cargo dry by applying 100 waterproof Nylon fiber. Robust Kevlar threads, heatwelded seams and reliable zipper together provide triple waterproof protection to your luggage on a road trip through rain, wind, sand and snow. UNIVERSAL COMPATIBILITYOur car roof bag is compatible with vehicles with or without roof rack. Mount the Car Roof Bag to any vehicle with side rails, cross bars or a basket. Or apply the Cartop Carrier to cars without luggage rack effortlessly with our firm door hooks sold separately. EASY TO INSTALLPlace the roof rack cargo carrier and mat on top of your vehicle. Mount the Cargo Carrier Bag to the top, close the zipper, and secure the straps with fasteners for extra car roof storage.