Compatible with Volvo XC40 2019-2023 Heavy-duty materials Made of high-density oxford cloth with a 1000D waterproof coating and 100% waterproof sealing. Snowproof, tear-resistant, dustproof, and sunproof to resist dust, rain, heavy snow, and storms. High capacity 15 cubic feet of storage space (135 cm x 90 cm x 40 cm). Easily accommodates four sleeping bags, four medium suitcases, and two double tents, expanding the vehicle load space for 4-6 people. Suitable for family vacations, camping trips, or road trips. Easy installation Designed for attachment on all four sides of any roof rack. Includes eight cinch straps with buckles. Loop straps around the cross bars and rails, connect to the buckles, and tighten to remove slack for a secure fit. Use scenarios - Family vacation with camping gear and multiple bags on a road trip. - Camping trips for 4-6 people requiring additional luggage space. - Winter or rainy travel where protected storage is needed for gear and luggage.