Hi Mike,
thank you for your input, it is greatly appreciated. I already have a small rollup pouch (although I didn't know the name for it until now). I was able to grab hold of a set of non-metrical wrenches on a local basar. It came in a pouch, although one that is a bit small for the bigger wrenches. But it gives also an idea where to go. I should have thought about it by myself.
Regards, Helmut