Super-thick wear-resistant PVC material. Use professional seamless technology. Has overall waterproof capability. Keeps your items and valuables dry even submerged in water. Easy to operate. Just grab top woven tape and roll down tightly 3 to 5 times and then plug buckle to complete seal. Not easy to be ripped, punctured, and scratched during outdoor activities. Even could be used as a lifesaving equipment. Leave a small amount of extra room for air in the bag and it will always float above water. Perfect for boating, kayaking, paddling, sailing, canoeing, surfing or having fun on the beach. Size: 2L.