Big barrels are large containers used to store and transport liquids. They come in two varieties: VATS (4 letters) and CASKS (5 letters). VATS are typically made of metal or plastic and are used for storing large quantities of liquid, such as wine or beer. CASKS are usually made of wood and are used for aging and storing alcoholic beverages. Both types of big barrels are essential for the production and storage of many types of beverages.