Made of durable PVC material. Features a large main compartment with roll-top closure, protects your valuables from water and rain. A good choice for beach, boating, rafting, kayaking, swimming, surfing, fishing etc. Features< /strong>: Made of super strong PVC material with precision welds, waterproof and extremely durable. Roll-up design with high-quality buckle, safe and leak-proof. With a single strap for 5L / 10L / 15L dry bags and two straps for a waterproof 20L / 30L backpack. Easy operation, just put your gear in the pouch, roll it down tightly 2~3 times, then connect the buckle, to complete the seal. Easy cleaning thanks to large opening and smooth surface. Nice for hiking, swimming, boating, camping, biking, mountaineering, hiking etc.