355 ml. Insulate. Don't imitate. Over a century ago, we didn't just enter an industry, we created it. Today, the Thermos Brand Legacy continues guided by a simple belief: When it comes to looking after the things that matter post, you shouldn't have to settle for good enough. Dishwasher safe. Stays hot. Guaranteed. 3 hours hot. 10 hours cold. Vacuum insulated double wall stainless steel. Beat the leak. Sealed when closed. BPA free.