Insulates hot food or beverages up to 6 hours Insulates iced drinks up to 24 hours Durable, double-walled construction High-performance vacuum insulation Large opening (external threads) accommodates ices cubes Compatible with most backcountry water filters No BPA, phthalates, lead or other toxins Made of 18/8 food-grade stainless steel (no liner needed) Electropolished interior does not retain or impart flavors Rounded corners are easy to clean with no hard angles where dirt, germs or bacteria can stick