Outdoor Research Durable Stuff Sack 5L, Black, 1Size Fabric performance: water-resistant, fully seam-taped, durable Design features: draw cord Cinch closure, dust flap, external daisy chain, webbing handle on bottom Functional Details Hydroseal A coated Antron nylon fabric, Hydroseal is waterproof and extremely durable. Waterproof taped seams Drawcord and Hypalon cordlock keeper closure