Ello Cooper 22oz vacuum insulated stainless steel water bottle features an FDA food grade silicone straw infused with Guardian Technology, which inhibits the growth of bacteria on the drink surface! A locking, leak-proof flip lid keeps the drink surface fully covered during transport. Just push the soft touch band to flip the lid open with one hand! Cooper keeps drinks cold up to 24 hours and features 18/8 stainless steel with an ultra-durable powder coat finish that won't chip or rust. With a built-in carry loop, Cooper is perfect for hydrating on-the-go. All parts are BPA free. It is recommended that the vessel should be hand washed and the lid is dishwasher safe. Recommended for use with cold beverages only.