During my long haul career for the last 10-15 years I used a large rolling duffel bag. It's a High Sierra 60cm tall double deck bag. The advantages are many, including the ability to tighten up the straps when I was doing a shorter trip and didn't need so much room. Being soft the baggage handlers never broke it either. Yes, I know, the bad guys can cut it open or bust the zippers but who packs real valuables in a hold bag anyway - no one with any brains. Some are very heavy when empty so check it out. I still use it when I go away on holidays.