Yeah, the one-shoulder thing was on my mind, too. The good thing is that it really stays in place well, but the bad thing is that it's just not the same on the other side of my body. I stood around the shop for half an hour with a loaded Metropolis version (and with a Kremlin, too) just to see what it would be like, and while I could switch it to the other shoulder like any other bag, I could tell that it was only a temporary, non-rideable position.

I'm really trying to stay with carry-on luggage for this year's trip because British Airways lost my stuff last time. They didn't even really try to get it to me, either -- I was in Germany for three weeks, and my one bag (that was too big to carry on... grr) went from Heathrow to Frankfurt and back to DC a full week before I was due to return. AND, it was missing one of its skate wheels.