It is made from ripstop tarpaulin with sturdy welded seam which is designed for years usage. The solid roll-top closure system provides secure watertight seal. Keep your gear dry in any wet situation where the bag is not fully submerged. Protect your valuables from water, snow, mud and sand. 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. Dry sack is easy to wipe clean due to its smooth surface. A nice Holiday Gift for families and friends.