Just wondering...
I have a small silver hard-shell one which is just right for cabin luggage. I also have a large pink/black one that is a good size for a long holiday or a holiday where you need lots of thick clothes etc.
Was eyeing up a nice green medium sized one this afternoon that I thought would complete my luggage collection 
as sometimes you've got too much for cabin sized but not enough to fill up the large size.
Though I don't really need to buy it as can get by with just large and small in reality.
Plus it's something extra to store.
So it started me wondering on whether other people had...