PROVEN IN THE LAB: tested against international standards by four different labs on four continents. All validated that Water-to-Go water purifier filter bottles remove up to 99.9999% of dangerous water contaminants. PROVEN IN THE FIELD: Water-to-Go is the water purifier filter bottle of choice for world-class endurance athletes and adventurers. In the toughest environments, they trust Water-to-Go to deliver pure drinking water. COMPLETE PROTECTION: protects you from all dangerous contaminants in water that can make you sick. The unique patented 3-in-1 filter technology removes up to 99.9999% of illness-causing contaminants from any freshwater source. It purifies and filters water while you drink with no need for plunging, iodine, chemicals, or batteries. PROTECTS YOU AND PROTECTS THE PLANET: one Water-to-Go 750ml/26 oz filter is equivalent to 400 single use plastic bottles of water. Our reusable and BPA free filtered water bottles ensure you have access to safe water anywhere in the world without buying environmentally damaging bottled water. DIFFERENT DESIGNS FOR DIFFERENT PEOPLE. The Classic large 750ml/26 oz bottle is tough and durable, great for demanding environments like travel, backpacking, hiking, camping and survival kits for emergencies. The 750ml/26 oz Active bottle is designed for active lifestyles and sports - great for athletes, cyclists, mountain bikers, bikepackers. The Active bottle fits a variety of bike cages and the one-handed flip-top lid protects you from cross-contamination by keeping dirt and grime aways from the fast-flow spout and your mouth. The Go! 500ml/18oz bottle is designed for small places (hand bags, gym bags) and small hands - the perfect water purifier filter bottle for kids.