WB-4: 11-1/2" diam. x 19", Yellow. Versatile and durable, your gear will stay dry inside these round bottom dry bags, even in adverse conditions. Shut out water by rolling down the top a few times and snapping the side release buckles together. The yellow and blue bags are constructed of extra heavy-duty vinyl /polyester tri-laminate with RF-welded seams. ItÆs quick and easy to find items inside the clear bags, made of durable waterproof 19 oz. vinyl with RF-welded seams. Great for power boats, sail boats, personal watercraft, kayaks, canoes, camping, motorcycles, ATVÆs, snowmobiles and car top luggage racks too!