The Spider Holster Spider Monkey Water Bottle Holder is made of neoprene and will accommodate one standard 20 oz water bottle. A drawstring closure at the top of the holder secures your waterbottle in place. Your Spider Monkey includes one holster base which iseasily attached to your belt. The base and holder combination arecompatible with other Spider gear such as the SpiderPro belt, BlackWidow belt, and the Large Lens Pouch. The holder is easily mounted bysliding it into the base, and removed by depressing the release tab ontop of the base. For convenience, mounting and removal of the holder areaccomplished with the use of just one hand. When thirsty, simply drink from your water bottle while it''s inside the holder. In addition tosaving time, keeping the water bottle inside the holder may helpmaintain its temperature.