Abstract: An apparatus for filing documents including a box-like container. There is a cover for the container which removably closes the top opening thereof. An expandable file folder has a plurality of divisions and is of a size which fully occupies the interior of the container and extends from one end of the container to another end thereof when expanded. There are mutually engagable tabs and slots or the like for releasably connecting the file folder to the ends of the container to maintain the folder in the expanded condition within the container. Preferrably the bottom of the container has four portions formed by extensions of the sides and ends. The ends of the container may be foldable along vertical center lines thereof. In the knocked-down condition the sides are folded inwardly along the center line and the portions of the bottom are folded upwardly and inwardly between the ends and sides of the container. Preferably the folded container and collapsed folder are removably received within the cover.