Keeps things neatly stored and organized. If you're stacking the box on the bottom may not fare so well. Otherwise same shape and size makes them easier to work with than the throw-aways they'll give you at the supemarket.
I use these regularly to organize and store my files. I stack them and unstuck them all year long and they hold up. If I pack them too full they can crush the boxes beneath them. Very reliable product.
I bought perhaps a hundred of these boxes in order to move across town. They worked just fine although it was necessary to tape the lids on so they wouldn't pop off.