Applicable car models: Roof Bag for Audi A6 C8 Avant 2018-2025 Premium Weatherproof Material: Constructed from heavy-duty 840D PVC fabric with heat-welded seams and a water-repellent coating, this bag ensures your gear stays completely dry during torrential rain, sleet, or heavy snow conditions Superior Capacity & Organization: Featuring a spacious 425-liter internal volume with a dual-locking heavy-duty zipper system, the design keeps your camping equipment, suitcases, and sports gear organized, stable, and protected from road debris Tool-Free Secure Installation: Engineered with reinforced adjustable straps and robust heavy-duty buckles that attach firmly to your vehicle's integrated roof side rails or crossbars, allowing for a rapid and rock-solid installation without any specialized tools After-sales service: If you encounter any problems during the purchase process, please feel free to contact us and we will reply to you within 24 hours