In Japanese mythology, Kameosa (瓶長、甕長, Long Bottle) is a youkai that takes the form of a jar.
Appearance
Kameosa takes the form of an old jar, usually of water or sake, and sometimes this can take upon itself humanoid features much like those of Tsukumogami.
Powers
Kameosa seem to be entirely beneficial, as any liquid store inside them will never run out. It spontaneously produce an inexhaustible supply of rice, sake, wine, water, or possibly any fluid one might put into it.