G4Free 15.7 Cubic Feet Waterproof Car Top Carrier, Easy to Install Soft Roof Bag Cargo Bag with Wide Straps-Works with or Without Roof Rack Without Roof Rack in Rainy Day, please see the Instruction from picture 2 to picture 6. Large Capacity: 15.7 cubic feet; Dimensions: 42 (L)x 36(W) x 18(H) inch ; Fit for Trucks, Suvs, Crossovers,Minivans and other larger vehicles. WATERPROOF SEALING:Dual Seam Technology and zipper flap. Attention:Make sure your Door Seal is in good condition to avoid the water getting into the car along the strap when it's raining. When you packed the bag, a flap and 8 Velcro covers the zipper. Ensure the waterproof edge down, clinging to the bag to keep water out. If the Velcro does not overlap over the zipper, the rain may possible get in. STRONG, WIDE STRAPS:Come with 10 Straps-3,000 lbs-strong Seatbelt-Style Straps ,Aerodynamically designed for kinds of cars,versatile and convenient. Maximize your vehicle's cargo space with this secure non-slip roof rack bag. Constructed with High quality materials this rugged rooftop cargo bag is guaranteed to protect your luggage & cargo from rain, snow, wind, and debris. Heavy duty cargo straps safely and easily secure to your vehicle WITH or WITHOUT roof rack. Material:Polyester fabrics with waterproof PVC coating inside and outside, a double-flap with 8 stick covers the zipper. Includes: carrier, stuff sack,10 nylon straps. We stand behind each of our rooftop cargo carriers with a 100% Customer Satisfaction Guarantee If you meet any question, please feel free to contact us.