LifeStraw Go Filter Bottle - 22 fl.oz.

Hollow-fiber filter membrane offers a high flow rate; sip on the straw and it filters the water while it's on the way to your mouth
0.2-micron filter physically removes 99.9999% of all bacteria, such as salmonella, cholera and E.coli; removes 99.9% of all protozoa such as giardia and cryptosporidium
Detachable filter is effective for cleaning up to 264 gallons before needing replacement; bottle can be used indefinitely
BPA-free Tritan® plastic bottle is lightweight and durable; leakproof lid and durable, flexible mouthpiece detaches for easy cleaning
22 fl. oz. LifeStraw Go Filter Bottle includes a carabiner for easy carrying