I've been using an Osprey Meridian wheeled backpack, which has a pair of good strong wheels and very tough exterior fabric and can be checked in (21," 60 L).
Lately, I've been thinking of replacing it with hard-sided 26" Briggs & Riley or Away 4-wheeled luggage, which would offer me more space for a longer (3-wee) trip.
But knowing the state of streets, sidewalks (the rubble, the unevenness, cracks, etc.), I also think that Briggs & Riley or Away are more for places in North America with better sidewalks than Greece, Rome, etc.
Any feedback or suggestions?