Clean water on the go. This double-walled bottle combines insulation with a filter, producing safe and tasty water that stays colder, longer. Fill it from the lake, river or tap, thanks to the membrane and activated carbon filter, for protection from bacteria, parasites, microplastics and particulate. Great for hiking, traveling, and day to day use. Double wall vacuum insulated stainles steel bottle keeps water cool for hours. Leakproof design with a soft silicone mouthpiece. Replaceable carbon filter disc reduces chlorine, bad tastes and odours, as well as organic chemical matter like pesticides, herbicides, and VOCs (good for 100L). Microfilter removes up to 99.99999% of waterborne bacteria and up to 99.9% of waterborne protozoan cysts. No shelf life or chemical taste. LifeStraw鈥檚 Follow the Liters program provides a child in a developing country safe with drinking water for an entire school year with every LifeStraw product sold. Exceeds NSF42 standards for chlorine removal and meets US EPA drinking water standards.