Klean Kanteen is the original BPA-free, stainless steel bottle. Why pick a Klean Kanteen water bottle? 1. Toxin-free materials - Klean Kanteen uses 18/8, food-grade stainless steel and BPA-free polypropylene #5 (for caps). 2. Curvy corners and rounded threads - It's easy to clean Klean Kanteens because they were intentionally designed with rounded corners and threads so there are no hard angles where dirt or bacteria can hide. 3. Large-mouth opens - to accommodate big ice cubes and for easy cleaning. 4. 100% Stainless environment - All Klean Kanteen bottles and canisters have stainless steel interior options available so drinks never touch plastic