Contigo AUTOSEAL Locking Stainless Steel Travel Mug 2 pack (ASTOR 2013) Vacuum insulated double wall stainless steel inner & outer walls Convenient lock button toggles to lock, preventing accidental spills while transporting Keeps hot items hot for 5 hours and cold items cold for 14 hours Fits under most single serve brewers BPA Free; Top rack dishwasher safe