This waterproof fanny pack waist pack from OverBoard features one roll-top main compartment that seals just like a typical roll-top dry bag; plus one external pocket with a water-resistant zipper. The main compartment has a Class 3 waterproof rating and the zippered front pocket only has a Class 2 rating. After rolling the top 2 or 3 times; simply buckle and cinch the side straps. The adjustable dry-fit mesh waist belt will fit waists up to 49 inches, but the waist belt can be removed completely if you want to attach this compact pack to your own belt or just strap it to the side of your pack.