This Stainless mug can be used for a mug, or used for a food storage container.The mug has a large mouth opening for easy access & cleaning. The lid incorporates a quailty, well designed radial compression seal for years of leak-proof service. Brushed steel finish. The mug vacuum insulation technology creates an airless space between two walls, virtually eliminating temperature change. So your drink stays icy cold or steamy hot no matter what the forecast.