Thinksport BPA-free Double Wall Vacuum Insulated Stainless Steel Sports Bottle Double-walled and vacuum-sealed. Keeps contents hot or cold for hours. Perfect of hot or cold beverages. Does not sweat (for cold contents) or burn your hand (for hot contents). Contoured design. Makes the bottle easy to hold and visually distinctive from the many, many straight-walled bottles available. Removable mesh filter. Keeps ice from blocking the drinking spout and allows users to conveniently brew loose leaf tea or make campfire coffee. Unsurpassed testing for material safety. Our products undergo rigorous chemical and biologic testing to insure they do not contain toxic chemicals.