I thread my belt through a toy 'biner every day (gate up) and clip my key ring to it. My key ring is really a utility ring: ResQMe, Arc AAA, whistle, Vic. Classic, spy capsules w/meds -- and keys.
When I was working, I used a convertible backpack for a briefcase. The carry loop on top had a full-size carabiner clipped to it. When I got to work, I used it to hang the pack from a file cabinet drawer handle, making the pack my personal file drawer, hanging behind me at the computer.
It worked so well, I began using it in the woods, clipping the pack to a small branch when I'd stop for a break.
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What I don't understand about this discussion is the negativity. None of us do the same things, have the same interests, enjoy the same activities, or find the same equipment useful. All together, we know many different ways of accomplishing the same tasks, and may consider our own ways best -- for us. But why denigrate or
insult other people's solutions to their own problems?