Have you used Op/Tech before? It is highly regarded.
I have put my Leicas among other things in these pouches. They are great for what they are intended - basic protection from scratching against things. I’ve also used their straps, that were some of the best available for a long time.
I've used them too. Very good pouches. Although Leica M case from Leica has no buttons that could scratch anything. It's just a piece of neoprene sewn into a shape that holds the camera without it being exposed or able to escape on it's own. It's also thicker than most of the Op/Tech I've used.
These are the days, huh.. where people jam Leica M8's in some $11.95 pouch and throw them into their bagpacks "with keys and other random bag shit".
FFS