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 Ultra-compact, our reconfigured filter is tiny but mighty with a super packable kit that doesn’t sacrifice weight or space Extreme durability: 2x thicker, premium materials make it tougher and ultra leak-proof Highly versatile means the collapsible squeeze bottle system is designed with every occasion in mind; Use as a bottle, push water through it into cooking containers or other drinkware, use as a straw, or connect to other Peak Series systems