【840D HEAVY-DUTY MATERIAL】 This is the FIRST car roof cargo carrier made with heavy-duty 840D abrasion-resistant PVC fabric, so compared to normal 600D, this cargo bag is more durable, more resistant to tear and extreme weathers. The soft material folds up for easy storage and allows you to carry odd-shaped objects. 【100% WATERPROOF】 Besides welded seams and waterp-repellant double coating, our car top carrier also features a concealed waterproof zipper with 6 inches extra wide velcro zipper flaps and 17 large velcros, it can keep the rain from trickling in through the opening, and offers all-round protection, even in downpour. 【UPGRADED DESIGNS 】 Our roof rack cargo carrier comes with an anti-slip mat and 8 thickended adjustable straps that will keep the carrier in place without scratching the vehicle, and 2 extra luggage straps offer extra security against the buffering of the wind or wear from constant use. We also adopt revolutionized technics to increase buckle robustness. 【UNIVERSAL FIT & LARGE CAPACITY】 Our 21 cubic feet rooftop cargo bag can fit with vehicles with or without roof rack, expands to 18 inches in height when full packed (52" wide and 40" deep). Easily hold 4-6 suitcases, tents, sleeping bags and more. 【RELIABLE GUARANTEE】You will receive 1x roof top carrier bag, 1x storage bag, 1x anti-slip mat, 4x door hooks, 2x extra luggage straps. 7x24 Qualified customer support, backed by 30 days money-back guarantee if you are not satisfied and a 10-YEAR warranty on quality issues. Try it. It's no risk!