LifeStraw Peak Series 3L Gravity System - Dark GreySimple, lightweight & compactible, the 3L Gravity System is ultra-versatile and fully leak-proof. It can be used as a storage system while moving about, as a straw filter by itself or with a standard water bottle. 
 Protects against bacteria, parasites, microplastics, silt, sand, and cloudinessEnhanced microfilter performance: Our re-engineered membrane and custom backwash accessory means better performance against sand and silt, maintaining great flow over the long haul. The water storage bag is made from premium materials for extra durability so it can stand up to the same toughness and usage you put your other gear through. You'll never have to buy anotherHighly 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 bottleMembrane microfilter lasts up to 2,000 L (500 gallons)Specifications:Weight: 228gDimensions: 22 x 52.9cmHose length: 1.2mIncludes: LifeStraw Peak Series 3L gravity bag with hose and standard quick connector, carabiner, leak-proof cap for water storage, easy carry strap, backwash accessory, user manual? Filter Specification:Membrane Microfilter Protects Against:99.999999% of bacteria 99.999% of parasites 99.999% of microplastics, silt, sand, and cloudiness Pore Size: 0.2 micronMembrane Microfilter lasts up to 2,000 L | 500 gallons – water will stop flowing through once the filter has reached the end of its lifetime