Nylon / Polyester Waterproof by rolling down the top a few times and snapping the side release buckles together * Water Resistant Zippered Pocket with Storm Flap on each side * Removable Shoulder Strap is Adjustable and Padded * Extra Heavy Duty Vinyl Polyester Laminate with Electronically Welded Seams; Molded Bottom adds structure * Large; dimensions 24-Inch x 12-Inch x 12-Inch closed; capacity 4270-Cubic Inch; 70-Liter