Description: For security reasons, we use 10 reinforced adjustable straps to keep the cargo carrier in place. Equipped with anti-slip mat to keep the cargo bag stay in place even on high speed roads or bump roads, no slip, no scratch to your car. Our Non-slip rooftop cargo mat is suitable for any car, truck, or suv with or without a roof rack and side rail. The roof bag (51*40*17 inch) was designed to solve the problem of limited storage space in the car. 21 cubic feet rooftop cargo carrier allows you to hold 4-6 suitcases, travel luggage case, tents, sleeping bags and more. Free up inside vehicle space for more comfortable on the way. Easy to install, the rooftop cargo carrier fits any car, truck, or SUV. If there are not roof side rails on your car, it can be quickly and easily installed to roof rack in minutes with 6 door hooks. Specification: Material: PVC Color: Black, Orange Size: 130x101x43cm / 51"x40"x17"(L*W*H) Installation: Open your door and carefully pull back the weatherstripping seal. With the seal pulled back, place one of the 4 included door hooks on the metal doorframe. Applying gentle force, put the weatherstripping seal back into place with your hand and close the door. Apply the same procedure to the other doors. These hooks will safely anchor the rooftop cargo bag. Note:Please allow a 3-5cm Difference due to manual measurement.Package Includes: 1 x Roof Bag with 8 Reinforced Straps 1 x Anti-slip Mats 1 x Luggage Combination Lock 6 x Security Hooks 1 x Storage Box 1 x User Manual