Keg is a popular device used to store and transport beer, wine, cider, and other fluids. In the keg refers to something that is stored or contained inside the keg. There are various synonyms that can be used to replace this term, depending on the context of the statement. Some of the commonly used synonyms for in the keg include contained in the barrel, stored in the cask, kept in the container, preserved in the vessel, retained in the drum, and confined in the reservoir. These synonyms can help to enhance the precision and clarity of your writing and communication.