Contigo Autoseal Randolph 2-Pack Stainless Steel Travel Mug with Button Lock Patented AUTOSEAL lid is 100-percent leak-proof and spill-resistant Easy, one-handed use with no caps or spouts; designed for both left-and right-handed drinkers Double-wall vacuum-insulated stainless steel keeps beverages hot for 4 hours or cold for 12 hours AUTOSEAL button slides to lock, preventing accidental opening of the mug when not in use Travel mug lid pivots open for easy cleaning and is top-rack dishwasher safe