A winery vessel is a container used to store and age wine. The three most common types of winery vessels are casks, vats, and tuns. A CASK is a large barrel-shaped container made of wood or metal, typically with a capacity of around 200 liters. A VAT is a large container, usually made of metal, that can hold up to several thousand liters of wine. A TUN is a large wooden VAT, typically with a capacity of around 500 liters.