The leak-proof* Stainless Carry Tumbler has a Flip Lid with safety lock that prevents the lid from opening accidentally. The lid is one-piece and gasket-free, and the stainless steel interior is SlickSteel® polished. Its vacuum insulation will keep drinks hot or cold, while keeping the exterior from getting hot, or minimizing condensation. A perfect companion for business meetings or studying! Stainless steel vacuum insulated construction with superior heat and cold retention Leak-proof*, gasket-free, one-piece lid is easy to clean and prevents the loss of parts (*When used properly according to the instruction manual) Flip Lid with safety lock (clip-type) prevents the lid from opening accidentally Lid is designed to minimize condensation from forming SlickSteel® polished stainless steel interior minimizes odors and stains BPA-free (all surfaces that come into contact with food or beverage) and 18/8 stainless steel