I don't think the combined weight of all books used in an entire semester would add up to 30lb, maybe if including dictionaries and atlases and other reference litteraturen that was kept in each classroom (or carted around on trollies by the teachers).
Have you ever seen the school books that Americans had to carry around? They were/are 2"/5cm thick books, weigh a few pounds each, and kids carried around about 6-8 per semester.
You made my point in that European school books are a lot less heavy and also less physically voluminous. The theory behind American books being that more spacing and less information per page makes learning easier, even though all the evidence clearly indicates that is very likely inaccurate.
Even though you are clearly one of those necessarily contrarian types for reasons that are your own, my point still stands that even if you had lockers for other reasons, the fact that school books in most European countries in which I have visited schools, utilize books that are a lot less heavy and are more information dense and can easily be carried around.
What is it with you types that you latch onto meaningless and nonsense things like that you did have lockers, while totally missing the core of the point, that the argument was about the weight and size of books??? That sounds like something you may want to think about.
> Lockers are simply not even a thing in Europe because children are carrying less and they have standardized backpacks.
Huh?