For the storing of office records--folders fit just right in boxes. Can stand correspondence up-right which makes folders easy to flip through. Outside of boxes easy to write on which makes it easy to later locate particular needed correspondence. Boxes are stackable which is a space saver.
The ingenious design of these flat boxes and lids guarantees fast and simple assembly requiring just a few folds of the cardboard along pre-creased lines. I will buy more of these in the future.