Zojirushi Stainless Steel Mug with the new PAC-MAN collection design has a Vacuum insulation that keeps beverages hot or cold for hours. Easy-to-clean nonstick coated interior. Tight fitted flip-open lid keeps beverages hotter or colder than travel mugs. Safety lock to prevent the lid from opening accidentally. Lightweight design for added portability. All materials are made of BPA-free plastic and 18/8 stainless steel.