The Osprey Hydraulics Reservoir 2L is manufactured using new MPE film, which provides the taste-free quality of PE (polyethylene) with the added benefit of extra strength over typical PE films. The “M” in MPE stands for metallocene, a special catalyst used in the manufacture of the PE resin. It forms a PE that is more consistent and even in structure, resulting in greater strength and resiliency, making it ideal for reservoirs. This added durability allows it to handle hot water as well as being BPA and PVC free. Developed with a new HydroStatic™ backer plate, it also creates a wider and lower profile, cleverly shaping the reservoir to ensure pack fit is preserved for optimal stability and comfort.