What is the antonym of cask?

The antonym of "cask," which refers to a large container typically used for storing liquids like wine or beer, would be "vessel" in a broader sense. However, if considering the context of specific types of containers, one might argue that "cup" or "bottle" could serve as antonyms, as they are smaller and often used for serving rather than storage. Ultimately, the choice of antonym may depend on the specific context in which "cask" is used.