"Just in case..."
I prefer to have my cameras in some sort of case when I'm out shooting. (Call me "clumsy" - I tend to knock into things ! )
As for Contax IIa / IIIa having "weak lugs", I have visited Mr. Scherer's excellent site several times ( makes my brain "hurt" every visit , LOL ), and I noted his caution on the lugs.
The "rewind-side" lug on my IIIa is quite loose. It has been my general experience that when structural parts get "loose", and begin to "work" against one another, failure is imminent.
I feel safer carrying my IIIa around now that it is wrapped in "fine Soviet leather"...
It is true that a case makes changing film a little slower, but then the completely removeable back on a Contax, plus that very loose spool flopping around (and falling-out) are a bother too. I tend to use the ER case to hold the camera while I'm re-loading. No matter what the equipment, I'm not a "fast" photographer.
I'm always a little concerned about the straps on old cases: I have a number of Leica cases that I WON'T use until I put new straps on them. And as far as screw-mount Leica cases go, I prefer the kind where the strap wraps all the way under the bottom, as opposed to being rivetted to the sides.
The Kiev case is a tad loose on the IIIa Contax, but no more so than an -f case on a pre-c Leica (read: I can live with it just fine).
Now to get on Henry's waiting-list...
Cheers,
Luddite Frank