I'm not a RB67 owner but I am a pentax 67 owner. I guess the cameras weigh the same and I would say this: If you want to use 6x7 you're obviously into quality negatives therefore wherever possible you should use a tripod, but of course you should have a back up plan for when you can't and gauging your personal minimum (or is it maximum) shutter speed is a must - it certainly does seem to vary from person to person. I regularly hike with a pentax 67, tripod, three lenses, extension tubes, film, filters, and a DSLR for metering/proofing tricky scenes (honestly it's all they're good for 😉 ). This is challenging, but worth it for the quality I get in return, I'm sure you could do the same with an RB, if you're fit and well organised . Obviously it helps if you can thin down your kit in advance, but often you need flexibility and that's when the weight goes up. Bear in mind ultimately if you like a camera you won't be carrying just a camera you'll be carrying a system. Also bear in mind the more you like a camera the lighter it will feel 😀 .
