Keurig stainless steel travel mug features double wall stainless steel construction and Contigo AUTOSEAL technology. Lid locking mechanism prevents accidental pressing of the Autoseal button. Heat retention: hot - 5 hours, cold - 12 hours. Leak and spill-proof. Fits under all Keurig reservoir brewers. 3.5" W x 7.8" H x 2.5" D.