I used the hard shell Samsonite case for when you could take 2 items onboard.
Tough as nails but pretty basic inside. Only flaw, couldn't expand.
Now I use the TravelPro Crew 5 22" rollaboard. It goes into the hold when airlining and can still fit into the cupboard on the bizjet. Fits pretty much every thing I need and then some for the 6 day tour and is expandable as well.
It's done 6 months with no problems.
As advised though, put something distinctive on it as one TravelPro looks pretty much like all the others.