Travelers Pak Rooftop Carrier for Cars & Trucks 15 cubic ft: * 15 cu ft of storage space * Adjustable strap fasteners with quick-release buckles keep contents secure * Reflective tape for extra visibility * Durable weather-resistant construction * Self-repairing nylon coil zippers * Handles for easy gripping * Dimensions: 36"L x 36"W x 18"H * Fits most vehicles with 4-way roof racks; racks must either be raised or have a raised snap clip * This product will not fit correctly on racks that are flush with the roof or have molded clips * Do not use on vehicles without a roof rack