Check the listing for details. NEW OKO 2 Pack OKOPURE 40-Refill Mini Filter (For Everyday Water Bottle). Condition: New. Listed at 2.95 USD. NEW OKO 2 Pack OKOPURE 40-Refill Mini Filter (For Everyday Water Bottle) FIRST CLASS SHIPPING IS A FLAT $3.95 FOR ANY QUANTITY PURCHASEDorPRIORITY MAIL SHIPPING IS A FLAT $8.50 FOR ANY QUANTITY PURCHASED New in retail Box 2 pack OkoPure replacement filters (40 refills each) Enjoy fresh and clean tasting water right out of the tap with the ÖKO 2-pack replacement filtration system. The filters feature a unique Upstream Hygienic system which uses a back flow valve to deliver fresh tasting water.More InformationIncludes 2 replacement filtersUpstream Hygienic system utilizes a back flow valve to ensure pure, fresh, and clean tasting waterFiltration system combines a patented NASA derived technology using an electro-adsorptive media with a patent pending filter cartridge designReplacement Filters ***Not for use with OKO Original or OKO Odyssey bottles***Note: This is for the replacement filters only, not the actual bottle or the cap that holds the filter.