A water filtering adapter with 0.2 micron filter size. A compact no-nonsense product, the LifeStraw Original has been tested and proven in disaster areas such as the Haiti earthquake and Pakistan floods. Compatible with Klean Kanteen, Camelbak, HydroFlask and Nalgene bottles with a 43 mm or 63 mm threaded cap. The product contains adapters for both of these cap sizes. This product is a filter adapter for certain bottle models. Bottle not included. - Chemical free - BPA free - No pumping needed - Highly compact - Filter life: approx. 4000 liters - Filters 99.9% of protozoa (Giardia lamblia and Cryptosporidium parvum) - Filters 99.9999% bacteria (escherichia coli, campylobakteeri, vibrio cholera, pseudomonas aeruginosa, shigella, salmonella) Don't allow your filter to freeze. Water expands as it freezes and may break the filter element. For each LifeStraw sold, money is forwarded to teh FollowtheLiters.com project. The sum given for each straw is enough to secure cl