Zojirushi DB50-BA Stainless Mug Black 17 oz/0.5 liter This Stainless Mug features a unique mouth design that is similar to a travel mug, with lock-tight lid that prevents beverages from spilling. It features vacuum insulation to keep beverages hot or cold for hours. Durable stainless steel construction and safety lock on lid to prevent the lid from accidentally opening.