3 Layer ABS construction for ruggedness and durability * Universal Mounting System mounts to square, round, and most factory crossbars * Ample 16 cu ft capacity can carry up to 8 snowboards, 8 skis, or 2 surfboards! * Dual opening system and lower side wall for easy loading and unloading from either side of the vehicle * Safety lock system- key only removes once the box is locked