Aquamira Blue Line Frontier Straw Water Filter. The ultra light Frontier Straw Filter has been trusted and used by hikers, campers and back-country enthusiasts for more than a decade. Add one or more to your backpack or travel kit to protect your thirst wherever you go. -Blue Line Protection: Removes Cryptosporidium, Giardia and biotoxins such as Microcystin/ --Increased Capacity: Filters 50% more water than previous design. --Simple Straw Design: Connect and sip to filer. --Lightweight and Compact: 1 ounce portable protection. --Miraguard Antimicrobial: Supresses g\the growth of bacteria, algae, fungus, mold and mildew withn the filter media. --Meets or exceeds ANSI/NSF 53....removes at least 99.9% of cysts. --Meets or exceeds ANSI/NSF 42...for Chlorine, Chemical, Taste and Odor Removal. --BPA free --Chemical Free --Iodine Free -Filters up to 30 gallons --USA