Anecdotally when we looked at packing solutions i was told of a seller of stem glasses (champagne).
Too many breakages so they tried thicker bubble wrap or whatever and the problem got worse.
Turned out the problem was 'stiction' between the wrap and the glass.
Went back to the old packing and wrapped the glass in a layer of tissue paper first.
Solved the problem.
I doubt that changing courier behaviour is the answer.
Daveinnj is right i think it is about what works now with the delivery companies.
Unless you ha