Made of high quality PVC material, the roof luggage has high wear resistance and weather resistance. And the zipper is also designed with an upgraded waterproof flap, so you can be sure your belongings are intact in rainy, snowy or windy weather. Equipped with 6 door hooks and 10 reinforcement straps, the car roof top carrier will performed well under these conditions: high speed, steep hill, curves and bumps. In addition, to protect your car roof and prevent your luggage from falling off, this roof bag has anti-slip pads to provide greater grip. And, the 4 digit combination lock and zipper with hooks keep the roof bag from opening while driving, thus add the safety of your luggage. Offering 15 cubic feet of space, this car roof bag is ideal for family vacations. Compatible with a variety of cars with and without roof racks and easy to store in the included storage bag, it is convenient to use. So if you are picking a roof bag, this waterproof and safe car roof bag will be the choice y