Collapsible Water Filter System For Camping, Rving, Road Trips, Cycling, And Protects against 99.999999% of bacteria (including E.coli, Salmonella), 99.999% of parasites (including Giardia and Cryptosporidium), 99.999% of microplastics, silt, sand, and cloudiness Enhanced microfilter performance: Our re-engineered membrane and custom backwash accessory means better performance against sand and silt, maintaining great flow over the long haul Extreme durability: premium materials make it tougher and ultra leak-proof Highly versatile means the gravity system is designed with every occasion in mind; Use as a gravity system, large squeeze bottle, as a straw, or use the filter with a water bottle. Your purchase has impact: one purchase, one child, one year of safe water LifeStraw is proud to be a B Corp and Climate Neutral Certified brand, committed to meeting the highest standards of verified social and environmental performance, transparency and accountability