Well, it’s not cardboard, but I am absolutely fascinated by euroboxes.

A europallet is 1200x800mm.

Then there are euroboxes of 800x600mm, 600x400mm, 300x400mm etc.

They are stackable, reusable and recyclable and come in different types. Fully enclosed, with lid, with grid walls etc.

Machinists use them as toolboxes, bakers to transport bread and veggie vendors stack have their products on the market in euroboxes.