Large mouth (1.75”) Made of 18/8, food-grade stainless steel, no liner needed No BPA, phthalates, lead, or other toxins Doesn't retain or impart flavors Internal, stainless steel threads Slim design of 12, 18 & 27oz sizes fit in most cup holders Rounded corners are easy to clean with no hard angles where dirt, germs or bacteria can stick Slim bottle fits in most cup holders Easy to hand wash