Like all Klean Kanteen water bottles, there is no need to line the bottle with plastic or epoxy (as is the case with aluminum water bottles). Klean Kanteen stainless steel water bottles will not retain or impart any flavors or odors, nor will they leach harmful chemicals into your drink like many plastic bottles or lined aluminum bottles. Just like every Klean Kanteen®, the 18oz Classic is made from high quality, 18/8, food-grade stainless steel that's totally free of BPA and other toxins.