Any recs on a BIFL key chain? Those rings always get bent over time, looking for something sturdy. Might just be a flaw in the design because if you can bend it enough to get a key on, you can probably bend it out of shape over time.
Hmm, that's a good point. It would have to be a relatively thin carabiner...
While searching for pictures I also found an interesting variant keychain called a "keycase" (picture attached). It doesn't use any rings. Perhaps that's the kind of thing you're looking for?