For long trips, I travel with 5d mk ii, 8-15, 16-35, 28-135 and either 70-300 or 100-400. For short trips, 8-15, 16-35 and 28-135.
I also bring along slik carbon fibre tripod + small rrs tripod head with panning plate, small Sunpak flash for fill flash, cir-pl and gnd with lee filter holder...