Simple, lightweight hydration system. The Hoser hydration system is a light, versatile hydration system that has become a backcountry classic. It has a simple, durable design that is practical for any activity and it comes in four handy sizes to fit practically any pack. Taste-free as well as BPA-, BPS-, and phthalate-free. Food-grade liner with rugged exterior is pliable and durable. Embedded silver-ion protects bottle from mold and bacteria. Hydration hose with lapel clip and Hyperflow(TM) bite valve makes it easy to drink on the go. Screw-top closure stands up to rugged use. Compatible with any threaded Platy lid or drink tube.