The other day, I bought a bunch of normal-price moving boxes. They come as one big cardboard unit which you bend in various ways. When assembled, they appear to be extremely strong and yet they are just folded cardboard -- no tape or any other kind of "mechanism" holding it together.
It freaks me out. I feel as if I should be taping them anyway on the bottom side. I don't believe that they can possibly work like this, even though I have lifted them up and walked around with them with lots of stuff in them to try it out. I keep feeling as if they will burst at any moment, and they probably will on the day when there's a bunch of scary strangers handling them when I'm moving. And then all my items will be crushed and scattered all over the street.
How is it possible that those boxes can have such a steady bottom just from folding two large and two small parts? It seems to my brain that it should not have any kind of support at all since nothing appears to be "locking it in place". Does it rely entirely on the walls pushing against each other or something?
And yeah, I had to watch several videos to realize how you are supposed to fold it. The instructions on the box itself are confusing to say the least.
I assume that this kind of box has been an international standard for many/several decades by now. It doesn't seem like a new invention at all.