1. The roof rack crossbars are made from strength materials that are lightweight and durable. This construction withstands extreme weather while delivering aerodynamic performance, reducing wind resistance and road noise for a quieter driving experience. 2. Universal 420D Waterproof Cargo Bag Car Roof Cargo Carrier Luggage Bag Storage Cube Bag For Travel Camping Luggage Storage Box 3. Extralarge storage space: expandable to 44 in L x 34 in W x 17 in H, offering a capacity of 14.6 cubic feet, ensuring ample space for large luggage. The soft sides allow you to fit irregularly shaped bags and can be folded away easily when not in use. 4. Aerodynamic design: The roof has an aerodynamic profile that significantly reduces drag and energy consumption, improves vehicle stability, lowers fuel use, reduces road noise, and enhances onroad safety. Use scenarios: Family road trips requiring additional luggage capacity for clothing, toys, and gear. Camping or hiking trips needing space for tents, sleeping bags, cooking gear, and outdoor equipment. Relocation or events where bulky items or gear must be transported without overloading the vehicle cabin.