@Walter Hinteler,
Walter - how could you carry / manage all that stuff? I struggle with one, 20kg, bag.
As part of the on-going disaster that was last year's England/Scotland trip, my bag died as I went to get into the cab at Heathrow. Part of my very short time with my friends was spent in purchasing new luggage. It was a bit bigger than the previous one - which does tempt you to add more stuff - which I then can't lift.
For my next trip, I've purchased a carry-on size bag - and I'll give it a run at the end of the month on a short trip. I'll check it - as I need carry-on for my camera, etc., but it shouldn't be too heavy to lift.