Made from ripstop tarpaulin with sturdy welded seam which is designed for years usage, tear, rip and puncture proof. Perfect for almost any extreme adventure you can imagine. Keeps your gear dry in any wet situation where the bag is not fully submerged. Protects your valuables from water, snow, mud and sand. Easy Operation and Cleaning. Just put your gear in bag, grab top woven tape and roll down tightly 3 to 5 times and then plug buckle to complete seal, whole process is very quick. 5L, 10L include one adjustable and removable shoulder strap for cross-body, 20L, 30L include two straps for backpack style carrying. Perfect for boating, kayaking, paddling, sailing, canoeing, surfing or having fun on the beach.