Outdoor Research Lightweight Dry Sack Fabric performance: waterproof, fully seam-taped, durable, lightweight Design features: roll-top closure, buckled lid, D-ring Functional details Hydroseal coated nylon is waterproof and durable Waterproof taped seams Inner and outer roll-top waterproof closures for greater protection from leakage; secure and nearly submersible Durable buckles secure roll tops