【Most Safe Design】 For security reasons, we use 4 reinforced adjustable straps to keep the cargo carrier in place. In addition, equipped with free reinforced adjustable straps and anti-slip mat to keep the cargo bag stay in place even in high speed road or bump road, no slip, no scratch to your car. Bonus: combination lock to prevent the zippers from slipping. 【Large Storage Space】 Roof bag was designed to solve the problem of limited storage space in the car. 15 cubic feet rooftop cargo bag 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. 【100% Waterproof】 Made of 600D Oxford cloth, car roof bag adopts a genuine waterproof zipper, used in extreme weather and is protected with a double flap. All seams are heat welded and stitched to ensure they are watertight. 100% waterproof and rainproof under extreme weather. 【Easy to Install】 Rooftop cargo carrier fits for any car, truck, or SUV. If there is not roof side rails on your car, it can be quickly and easily installed to roof rack in minutes with 4 door hooks. 【Easy to Carry】 Folds compact for easy storage and could put in the carry bag.