The term 'winery container' refers to the vessels used to store and transport wine. The most common containers are the TUN (3 letters), CASK (4 letters), VAT (3 letters) and KEG (3 letters). A TUN is a large barrel, usually made of wood, that can hold up to 252 gallons of wine. A CASK is a smaller barrel, usually made of oak, that can hold up to 132 gallons of wine. A VAT is a large metal or concrete tank that can hold up to thousands of gallons of wine. Finally, a KEG is a small metal container that can hold up to 15 gallons of wine.