Bankers Box Premium Storage Boxes, are made from 100% recycled board and are double sided to ensure maximum strength as a heavy duty box. This enables up to 6 boxes to be stacked on top of each other, saving storage space. Being heavy-duty these boxes are also ideal for frequent use and movement. With Prestoâ„¢ technology these boxes can be assembled in just one second just by pushing the corners together, making these boxes the perfect time saving solution where a large number of boxes are required. These Tall boxes are able to hold Lever Arch Files as well as Ring Binders and Transfer Box Files.