Seychelle Outdoor Water Filter Straw - Hiking, Camping, Survival, Travel, and Emergency Preparedness Manufactured by the most trusted name in water filtration for over 20 years, the Seychelle Emergency and Outdoor Straw is the top-performing filter straw on the market today. The most comprehensive protection from all FOUR zones of water contamination: radiological (Radon 222, Cesium 137, Gross Beta), aesthetic (chlorine, disinfectants), biological (Cryptosporidium, Giardia, Virus), and chemical (agricultural and industrial runoff in lakes and streams). Beware of competitors that only provide protection from one or two of four. Kills bacteria and virus to 99.9999% Ideal for travel, emergency prep, bug-out bag, camping and backpacking anywhere in the world. Ultra-lightweight, easy to slip into backpack, BPA-free, USA-made filter