depends on your purpose of trip...
for leisure? you wont wanna get burden down by equipments...
for sight seeing and photography... you sure wanna have enough equipments inclusive of tripods... thus weight will not be an issue...
get down to the skeleton... whats your intention when you're overseas and are you prepared to get burden by lots of equipments to cover all angles and purposes... or you're just leisure around and wanna be as light and convenient as possible
I usually bring along a compact PnS along with a DSLR(used to be DX only but had added an FX body last year, so more options) when travelling and use it as a back-up. Which body i bring really depends on where & how i am travelling.
FX - 16-35F/4, 50F/1.4 and 105F/2.8.
DX - 11-16F/2.8, 35F/2 and 85F/1.4.
All the heavy lenses(eg. 24-70 or 70-200) are not in my considerations for travelling.
If its for leisure sightseeing, with bare min. equipment, what is a good range?
Since I will be travelling with kids, I prob will not have much time to spare on photography (that is can't spend much time on any specific location - i.e touch and go)
Up and coming,
10-22mm + 17-55mm/2.8 + 70-300mm + Di466 flash + tripod
A lot depends on weather and location. The more cooling it is, the easier it is to carry without sweating like a pig. Sometimes, no need to bring everything out, can leave some of it in the hotel if not needed.