RoofBag Roof Cargo Carriers:- manufactured in USA- waterproof and heavy-duty- easy to install on any vehicle WITH or WITHOUT rack- PREMIUM option available with triple-seal technologySafety- will never fly off your vehicle (straps are not sewn to the bag)- no harmful ingredients or additives- fire resistant- 3,000 lbs strong seatbelt-style strapsConstruction:- aerodynamic shape for quiet and fuel efficient trips- double-coated abrasion-resistant vinyl- rip and peel resistantSpecially formulated fabric to withstand:- extreme temperatures- wind, snow, sand- continuous sun exposureWhich option should I choose? 11 cu. ft. works on ALL vehicles- same space as 4 medium suitcases15 cu. ft. works on full size sedans, SUVs, or vans- same space as 5 medium suitcasesHow is it installed?Side rails: straps attach to side rails left-to-rightCross bars: straps attach to bars front-to-backBare roof (no rack): straps pass through the inside of the car through door frame, doors close over strapsWhat's IncludedRoofBag Carrier2 StrapsInstallation BookletRecommended Accessories (Sold Separately)RoofBag Liner Bags - Simplifies packing into 3 liner bags making it easier to load and unload your items onto your carrier RoofBag Protective Mat - Non-slip mat protects the roof of your car and prevents the carrier from shifting during travelRoofBag Extra Straps - Use in addition to the set of straps included with carrier for additional attachment optionsCall our team M-F 7:30AM-4PM PST: 800-276-6322 - we're always more than happy to assist