Siliconized on the outside, tough Cordura nylon is weatherproof and durable Polyurethane coating on the inside permits the fabric to be seam taped Waterproof seams are double-stitched and factory-taped for added weather protection Hypalon wateright rolll-top closure keeps contents secure and protected Fold the Hypalon strip down first and make at least 3 rolls before closing buckle Ultra-Sil sacks are designed for backpacks, not suitalb for boating Comes in assorted colors, specific color requests cannot be accomodated SPECS Best Use:   Backpacking Material:   Siliconized Nylon