Well, they could have asked anyone who ever had worked in a ware house for tips. Probably some people working on there had ideas like that, too. I mean it's s

Well, they could have asked anyone who ever had worked in a ware house for tips. Probably some people working on there had ideas like that, too. I mean it's such a common thing that there are EU standardized sizes for stack-able boxes (and as far as I can tell they existed since pre-EU, or at least I can't remember my dad not using them in his little shops storage room). The sizes are so common that even car manufacturers consider them when designing (some kinds of) cars.