The term Vintner's Barrel is composed of two words, CASK and VAT. A CASK is a large barrel or container used for storing and aging wine, beer, and other alcoholic beverages. A VAT is a large container, usually made of metal or wood, used to store liquids such as wine, beer, and other alcoholic beverages. Together, these two words form the term Vintner's Barrel, which is used to refer to a large barrel or container used for storing and aging wine, beer, and other alcoholic beverages.