Overseas travel and not a photo trip?....without question the Hasselblad and no more than two lenses. I do this all the time with a 501CM, 60 & 100 CF and get great results, decent sized kit, fantastic photographs. All that matters in photography is the impact of the photos you got, so use gear that stays out of the way.

If it were me I would bring either the two lens Hassy kit or my dinky bag with an M3 / 50 1.4 lux and my Xpan with three lenses, that kit rocks for overseas.....

Don't get me wrong, I love 4x5, just souped 130 sheets in a row as part of a marathon film souping session. But it is a LOT more to deal with overseas, even John Sexton leaves his Technika stateside preferring the Hasselblad for overseas work.