A box about 4x4x4 made of wood seemingly just like a normal box of the same size however it has the words Fill in Celestial. If a person who is attuned to the box puts a single object into the box, then close the lid. The box will reproduce the object as many times as it can till it fills the box. If a liquid is placed inside, it will reproduce enough to fill the box to the top of the lid.

The box cannot reproduce more than one item at a time, and cannot make objects that are also of legendary rarity.

The box will treat the original object or liquid as the target tell it is removed. The copy or amount of liquid does not disappear upon resetting the box with another object.

If the Object is a bag of holding it will create a black hole and will be unleashed upon the world probably destroying the world and the killing the party.

Enlarge/Reduce spell can effect the box.

The weight of the box does not affect the surface it is on. However if the box tries to be moved from the surface the weight will be as if their was that much of the object or liquid in the box to begin with. So if a 1x1x1 cube weighing 100 lbs is placed in the box, upon closing the lid the box will weigh 6400 lbs.

credit for the idea is for Dale Bulla who wrote “the magic box: a folktale”