I use the Lowepro lens cases for my 35mm kit and a small aluminium flight case for the Bronica (although it's no longer quite big enough).

Part of the advantage of shooting older gear is that you can use smaller cases. My 1970s 120mm f2.8 is smaller than a Coke can, you'd struggle to find anything with the same focal length and speed in a small package now. That lives in a Lowepro Lens Case 1S, which fits nicely on a belt and holds the lens snugly.

My only complaint with the Lowepro system is that there's a bit of a gap between sizes. I could do with something like a Lens Case 1.5, as while the 1 isn't quite long enough for my 200mm f4 the 2 is massively oversized.