Last year I purchased a set of RB67.
Even though I have a few Pentax 6x7 lenses,
I decided to go Mamiya based on my ability to repair/adjust/restore the RB67 bodies.
and also because all my MF cameras take the standard 6x7 rollfilm (RH10) backs, same as the RB67 does.
After a few years of using non slr medium format cameras, the slr is luxury.
I have the super heavy prism because I was not able to get accustomed to the chimney vf.
I found a carry case on Etsy of about the same vintage as the RB.
So I can travel with the Camera set up with the back, the Mamiya Sekor C 1:4.5 50mm and the prism.
The Mamiya Sekor C 1:3.8 90mm fits sideways in the case under the camera.
https://app.box.com/s/0ty5dvtgtj1u49upiqs4q2o204i3mp47
Using C41 film. I seem to be able to guess exposure well enough without a meter.
The case has a wide strap and the loaded weight is 6 kg,
which is almost at the Qantas carry on limit.
The longest I have carried it was for about 1 hour walking around,
and transferring the sling from shoulder to shoulder.
Last year I took the RB67 to Australia.
Here I revisited Her Majesty Beechworth Gaol where 32 years ago they locked me in a cell for an afternoon.
(..But just to do a structural engineering exam remote from the university!)
https://app.box.com/s/2g9q96zy1pktun7ruw2rv2gvkixofdea
Here is one of the Murray River, right into the sun with the 90mm.
https://app.box.com/s/w91a0muan704b29offcglzmdrh22d3lu
The slr can sharply do lower light open aperture photos that are difficult/impossible for me with a rangefinder.
( Michigan, with Fuji pro 400ns)
https://app.box.com/s/gd5ojj0ivddc7cqxqc30xoxhx1yg22v9 https://app.box.com/s/75d6e107gfday8k09t2rk55bqowr0fg1 https://app.box.com/s/muqojmp4q6vsm4zuiw0le7y69ad1dhe9
This year I was unable to carry the RB67 kit due to flight connections,
so I took the Ricoh KR-5 and the SMC Pentax 1:2.8 40mm with Fuji 200 Superia.
Certainly a lot easier to walk around with and I will be interested to compare the scans.
I have found it is easier to get good quality development and scans from the medium format 120 film than the 35mm.