Nilight Car Roof Bag 15 Cubic Feet Waterproof Rooftop Cargo Carrier,Suitable for All Vehicle with/Without Rack – Waterproof Zip,Reflective Strip,Anti-Tear 840D PVC, with Anti-Slip Mat. Eight reinforced adjustable straps and 4 door hooks. to keep the cargo carrier in place. In addition, equipped with free anti-slip mat to keep the cargo bag stay in place even in high speed road or bump road,and protect your car roof from scratches and damage.