Contigo Autoseal Travel Mug - Stainless Steel Mug With Easy Clean Lid - 16 Ounce - Green Patented AUTOSEAL lid is 100% leak-proof and 100% spill-proof. Drinking made easy! Press to sip. Release to seal. AUTOSEAL automatically seals between sips to ensure no spills. Vacuum-insulated technology keeps beverages hot for 4 hours, and cold for 12 hours. Contoured body makes this mug easy to hold and easy on the eyes. Will hold up to 16 oz. of your favorite beverage and fits most standard car cupholders.