Product Description All of the seams on the si-mute-pu treatments to provide waterproof stuff bag. Can also be dead space to when you store them in a backpack; Round bottom design for maximum strength. Specifications [Material] 40 denier nylon ripstop [hydration Pro coating] [Weight] G [color] Citron Yellow (Cyl/da-kuhuxyu-sya (dkfs/Gun Metal (GM)/puraimari-buru- (prbl/Sky Grey (skgy) [size] Φ 11.5 x 26 cm