Made from Tritan™ Copolyester, this bottle features a patented filter and freezer stick system which reduces chlorine taste and other impurities. Can filter up to 150 gallons of water before being replaced after approximately 4 months depending on usage. Water flows easily through built-in straw and filter, to produce cold, great tasting water. Can purchase filter refills at coolgearinc.com. The style # is 749. 24oz.