Attaches to roof top racks Made with rugged waterproof tarpaulin material with heat-sealed seams to keep contents dry Keeps luggage safe, dry and secure - holds (four) 27” suitcases Includes a storage bag for easy transport and storage Heavy-duty, waterproof zipper and dual, overlapping flaps Quick release buckles for easy access Folds down into small storage bag for easy keeping and carrying Measures 35 x 35 x 18 inches / 89 x 89 x 46 cm when in use