A case assembly for holding a selection of paintbrushes of the type having bristles bound to a handle with a metal band. The case assembly has ventilation openings that provide ventilation to the interior of the case. A support board is provided that is sized to fit within the interior of the case. At least one magnet is coupled to each support board. Each magnet attracts the metal bands of the paintbrushes, therein attaching the paintbrushes to each support board. By attaching the paintbrushes to the support boards with magnetism, the bristles of the paintbrushes remain unconfined. Furthermore, the paintbrushes can be attached in any orientation, such as a bristle-down orientation. This prevents water from gathering near the metal bands of the paintbrushes and causing rust.