Access drinking water anywhere. Convert your reservoir or water bottle into a water filter. The 28 mm inline filter sets a new standard for lightweight, fast and versatile backcountry hiking water filtration. Compatible with all HydraPak 28 mm opening bottles and flasks, as well as Plug-N-Play connectors used on reservoirs and water storage containers. Effectively removes common waterborne bacteria, such as E. coli (99.99%), and parasitic cysts (99.99%) per EPA Guide Standards and NSF P231 and microplastics (99.99%) per NSF 42 greater than or equal to 3.0 microns in size. Filters approximately 1,500 litres of fresh water at a rate of >1 L per minute. PRODUCT INCLUDES: Filter, Cap Adapter and Backflush Adapter Specifications: Diameter: 34 mmWeight: 47 g (filter only)Length: 129 mmMaterials: PP/POM, EPDM, Silicone, Hollow Fiber