The Thermos® Sipp 16 oz. Vacuum-Insulated Travel Tumbler features TherMax® double-wall vacuum insulation for excellent temperature retention of your favorite beverage. The stainless-steel construction is unbreakable and BPA free for safety, and the leakproof lid can be easily opened or closed with 1 hand. A built-in tea hook easily holds a tea bag or most loose-leaf infusers. Dishwasher safe.