This light weight chemical-free filtration system removes 99.9999% of water borne bacteria and protozoan cysts such as Giardia and Cyptosporidium * Military tested, essential backcountry/travel companion; Filters hundreds of liters of drinking water; No chemicals, no pumping, no batteries * Original pop cap for safe and leak proof use; 100% made in U.S.A. BPA-free polyethylene & Nylon * The most portable microbial filter bottle on the planet * All Vapur bottles come with an integrated carabiner, making it easy to clip to your pack or belt loop