Ok, Harry Fleenor worked well on my new-old Rolleiflex 2.8f. It is back and I am very happy with the Extra Large Zing Pouch, the one that is pictured by Zing with a Hasselblad moving in ..
The camera fits well with the metal hood etc on; there is room for a layer of 120 films (4) and a small light meter (the camera 50 year old selenium cells are useless, erratic, near dead ..).
I house my spare carry around film inside a pair of 135 film cans [cut out bottom of one cleanly (carpet cutter type utility knife), make sure the inner edge is smoth (file protrusions away ..), then push the bottomless one into the top of a complete 135 cannister (both black!), keep pushing down until the inside cylinder has the right size for a 120 film spool with film; seal junction with electric black tape on the outside (2 loops), insert new film, close top : done]
I put one layer of padding from an unused bag in between bottom layer of spare film rolls and camera.
Finally I used a Lowepro belt to put through the loops on the Zing and I carry the bagged camera with film, meter, .. on my hip for easy access and bump protection ...
The strap I use is a Domke Gripper, 1 1/2 inch wide. I cut off the corners of the end of it (45 degree angles, just for rounding the strap end for easier use), burn the ends on a candle so not to fray, file the hard thick edges (after the burn) down to be as slim as the strap web and put a needle and thread through near the end to let me pull the straps through the metal attachement loops of the camera body(the very front gap there works best for aneven balance).
All this works very well. 1/2 hour; done forever.
But the Domkes need to be reverse threaded at the very end! There are 2 little rectangular plastic 'ring' pieces with the strap. I rethread the 'sharpened, rounded' very end of the strap back into the middle of the very last of these 'loops', pull hard to make it jam that loop and the strap does not slip any longer.
I did that on my other D Gripper on the Contax, too, because I had noticed that eventually the strap end becomes shorter and shorter ... as if it wants to slip out of its hold ...
Anyway, this is what I am happy with for the Rollei 2.8f.