Trailshot Pocket Sized Water Filter Size:One Size Slim Cooler Cup Collar locks 627065838 Slim Cooler Cup Collar locks in the cold with a snug fit for cans USA made revival of reel designer Stan Bogdan’s iconic 1971 reel 25 cm Height (Standard):6 in Height (Metric):16 cm Effective against bacteria:Yes Effective against chemicals toxins:No Effective against particulate:Yes Effective against protozoa:Yes Effective against viruses:No Filter media:Hollow Fiber Filter pore size (microns):0 Instant Hydration: Drink directly from the source—without lying in the dirt—and refill your bottles or hydration reservoir with clean water