The Manna™ 17 oz. Verve 18/8 stainless steel coffee mug has a unique (patents pending) twist-action seal lid. To take a quick sip, simply push the lever on the lid either direction and drink, push the lever back for a leak-proof seal. This innovative design allows for one-handed operation. In addition, this lid also features a lock that will keep your drink safe and secure for storage or transport. This tumbler's double wall vacuum insulated construction keeps your cold drinks cold for 18 hours and hot for 8 hours. BPA free.