34-ounce BPA free water bottle with 0.1 micron absolute hollow fiber membrane inline filter delivers fresh, clean drinking water Removes 99.99999% of all bacteria, such as Salmonella, Cholera and E.coli; removes 99.9999% of all protozoa, such as Giardia and Cryptosporidium, and 100% of microplastics Designed to have a high flow rate for easy access to fresh, clean water; easily field maintainable; simply fill from a river, lake, or faucet Includes 63mm cap that fits standard wide mouth compatible bottles, inline filter, and backwash syringe. Newest model no longer includes additional straws. Use for hiking, backpacking, camping, and emergency preparedness; can also use the included filter inline with a hydration pack’s tubing