In Greek mythology, Pandora’s vessel is called a pithos in Hesiod’s Works and Days. A pithos was a large storage jar used in the ancient Greek world for commodities such as grain, wine, or oil.
The word matters because the earliest literary version does not describe a small hinged box. Erasmus’s Latin translation helped popularize the idea of a box by rendering the Greek vessel as a container associated with a box, and later European art reinforced that image.
An amphora is a different vessel, usually characterized by two handles and a narrower shape. A krater was used for mixing wine and water, while a lekythos was a smaller oil vessel. These distinctions make pithos the specific answer for Hesiod’s container.