I found a picture showing the box in this way a month ago, I came across a foreign site and learned immediately. Then I made a lot of boxes, especially the working desk, ideal for putting jokes. Unfortunately I can not remember that site, so I photographed myself in stages. The photos are not very good, but they will still give you an idea.
The box is very solid and works even in the simplest notebook case. It may be thicker and harder when made with cartons sold in stationery, but it may be difficult to fold in small sizes. You can even do with newspaper, for example. Vintage looks, if you do the newspaper twice, it will be even more robust.
After you have made the box, you can cover it with a little more size. It does not need any bonding, but you can stick a little glue on the ears you see in the last picture.