I hate luggage. I mostly travel with a GoRuck that's much smaller than max carryon size, and I still loathe having to carry it around once I reach my destination. So I want a thin and light briefcase/folio that can fit into the backpack's laptop compartment (15'' size). A shoulder strap would be a nice bonus. Also, something that looked classic and/or very high quality would be good, since the backpack is so rugged and practical. Price is not a major consideration. Any suggestions would be gratefully received.