Lock in Security: This car roof bag for all vehicle features a thoughtful combination lock that not only prevents the zipper from sliding, but also provides additional security for your belongings. It helps prevent theft or accidental opening, ensuring a safer and more reliable travel experience. Universal Compatibility: Our luggage carrier bag for car rooftop fits any size and model of cars, trucks, or SUVs, whether equipped with roof racks or not. It comes with a non-slip mat, storage bag, 6 door hooks, and a combination lock, providing a convenient and secure storage solution for your travels. All-Weather Durability: Made from heavy-duty, high-quality 840D PVC material, this rooftop cargo carrier offers excellent abrasion and tear resistance. It is designed to withstand harsh weather conditions, providing long-lasting, reliable protection for your luggage. Large Storage Capacity: Measuring 52" x 39.8" x 17.3", this 21 cubic feet roof cargo carrier offers ample room for sleeping bags, luggage, tents, and more. It's the perfect storage solution for road trips, camping, or family vacations, ensuring a more comfortable and enjoyable journey. 100% Waterproof: Crafted from 840D PVC waterproof material and featuring a waterproof zipper, our car rooftop cargo carrier bag ensures your luggage are protected from rain, snow, or moisture, keeping them dry and in perfect condition throughout transportation.