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Thanks Paul, I'm looking forward to experimenting with the 20-35, it seems a good supplement to the 24-105 and its a group A lens on the 5D3 It will probably need extension for close shots.
Thanks David and Goldscout, I've been using G series for backpacking for years and the G1X IQ is so good I don't feel I'm sacrificing if it grabs the image instead of the 5D. On our Greek trip last year they really complemented one another. From Goldscout's great gallery it looks like I'll be using the 70-200 quite a bit for street and the G1X can provide the backup wide range.
Thanks Rockant, I've thought about a vest. My light field jacket has large cargo pockets which I'll press into service if necessary. Always good to have contingency plans.
I think there is a wealth of information and ideas here, thanks everyone. For future search use, here is my current list of gear for the trip:
5D3, 20-35 f2.8, 25-105 f4 IS, 70-200 f4 IS, iPad : 8.5 lbs in my pack.
G1X + polarizer + close-up lens, SD850 P&S, small binoculars, iPad : 4.5 lbs in my wife's pack.
Plus spare clothes, meds, head lamp, cell phones, & etc.
Packed luggage: We each use a usually carry-on legal size rolling suitcase. 40 lb. limit but we'll probably be around 30 lbs each.
Gitzo 1058 tripod with RRS BH25 < 2 lbs.
RRS PCL Pano head and rail for panoramas 1 lb.
Stoney Point walking stick with lens support 1/2 lb.
270EX flash 1/3 lb.
1.4x teleconverter + 12 & 20 mm extension 3/4 lb.
remote release cables, memory cards, 3 batteries each, chargers, cleaning kit < 2 lb.
underwater housing for SD850 3/4 lb.
Plus clothing, first aid kit, swiss army knife, etc. Lots of Patagonia and Railriders nylon and fleece, etc.