The OutThere Hydration Reservoir is produced from a premium Made-in-USA Metallocene film. Our premium reservoir film is anti-microbial treated against a variety of gram+ and gram- microbes as well as mold and fungus. USA test lab certified. This unique formula means zero plastic taste or smell. This proprietary plastic polymer was originally developed for medical use. The super tough construction results in maximum abrasion resistance material. Includes 2 bite valves, one twist locking.