I like very simple things that get the job done,
but the usual stuff available here is a bit too much.
So thanks Alexander,
after checking all the links and some more browsing it was clear:
The Classei system is the one with all the options.
I'd still like some simpler folders, but these work well.
(And I might even be able to persuade them to calm things down
Their service is good and fast, but it has a sophisticated pricetag.
So one wants to make sure that only the Classei things are ordered from Classei.
By the way, they seem to look for distributors outside of Germany
Works for me and I can recomend it.