Thermos 16 Ounce Vacuum Insulated Travel Mug, Steel/Black The Sipp Thermos line combines sleek style with unique functional features Thermos patented vacuum insulation is designed for maximum temperature retention; keeps liquids hot for 5 hours and cold for 9 hours Crafted with a durable stainless-steel interior and exterior, the tumbler is made to endure Eastman Tritan lid is BPA free and has a built- in tea hook for tea bags or most loose-leaf infusers Leak-proof lid with one-hand push-button operation; holds up to 16 ounces; cleans safely and easily in the dishwasher