The LifeStraw double wall vacuum insulated stainless steel water bottle contains an advanced filter that protects against bacteria, parasites, microplastics, chlorine, organic chemical matter, sand, dirt, and cloudiness to improve water taste. The insulated, leak-proof, stainless steel bottle is ideal for camping, hiking, travel, outdoor activities and everyday use. Simply fill with water from a lake, river or tap and filter on the go. No more need for single use plastic bottled water. LifeStraw filters are rigorously tested to meet protocols established by the US Environmental Protection Agency (EPA) and NSF International/ANSI. Your purchase has impact. For every LifeStraw product purchased, a school child in need receives safe water for an entire school year.