The original PlatypusA(R) water reservoir that became a backcountry classic, the Hoser(TM) is an ultralight, minimalist hydration system that delivers taste-free hydration with a versatile, durable design that makes it great for backpacking, thru-hiking, and day hikes. Updates include a new self-sealing HyFLO(TM) bite valve that delivers a 30% increase in flow rate, making it quicker and easier to hydrate on the go. Drink on the go: New simple, one-piece, self-sealing HyFLO bite valve makes it quicker and easier than ever to hydrate hands-free with a 30% increased flow rate. Easily transportable: Integrated hang/carry loop makes it easy to secure the reservoir in a backpack or elsewhere. Pure Platy experience: All materials are certified taste-free, BPA-free, BPS-free, and phthalate-free. Funk-free: Embedded silver-ion protects reservoir from mold and bacteria. Versatile: Threaded port and 1/4" diameter drink tube make it easily compatible with accessory caps and adaptors.