The Daycap lid with its integrated filter is a minimalist choice. It filters out 99.9% of protozoa and 99.9999% of bacteria, meeting EPA and NSF standards. NOTE! This product does not contain a bottle. This is a filter cap compatible with the following, separately available bottles: Nalgene Wide Mouth, Hydro Flask Wide Mouth, Yeti Yonder and CamelBak Wide Mouth bottles. The Wide Mouth standard has a diameter of 63 mm. - Filtration rate: up to 1 liter per minute - The cap includes a flap to protect the drinking spout from dirt - The package includes the lid and its attached filter element If/when the filters flow rate seems to slow down, shake the bottle vigorously - this helps clean the hollow fiber filter. Do not allow the filter to freeze - freezing can damage the filter element if it remains wet. [User manual](https://www.platy.com/on/demandware.static/-/Library-Sites-cdiSharedLibrary/default/dwdae5498d/pdf/manuals/34-338-1_Platypus_DayCap-WEB_Instructions-English.pdf). (opens