Economical solution to organize plans in office or permanent storage.  Durable with exceptional stacking strength. Attractive corrugated cardboard with reinforced bottom.  Gray lettering on white background. Side handles with identification labels on interior and exterior. The MGR-25 & MGR-37 have 16 slots @ nominal 4"x4" or partitions can be removed to create 4 slots of 8"x8".  The  MGR25-9 and MGR-37-9 have 9 slots @ 5.25"x5.25"