RoofBag Waterproof | Made in USA | 1 Year Warranty | Fits All Cars: with Side Rails, Cross Bars or No Rack | Car Top Carrier Includes Heavy Duty Straps RoofBag top carriers are waterproof: made with heavy duty canvas coated on both sides with abrasion-resistant waterproof vinyl. - PREMIUM option (separate listing) uses Triple-Seal technology and 2-year warranty for maximum protection against extreme weather. Manufactured by RoofBag in the USA with the safest and highest quality materials: no toxic or harmful chemicals used. Size 11 fits ALL cars. Size 15 fits full size cars. Select FOR RACK for cars with side rails, cross bars, or baskets. Select NO RACK for vehicles with a bare roof. Includes heavy duty straps (3,000 lbs strong). Straps are made with ANTI-WICK technology to prevent water entry into vehicle in cars without rack. Easy installation: FOR RACK: straps attach to side rails or cross bars or basket. NO RACK: straps loop from top of bag through inside of car; doors close over straps. Straps don't interfere with door seal or window or side curtain bags. 1-year warranty.