I found these on amazon, and each one has a belt loop and holds three 4x5 film holders comfortably. I find them handy when I don't want to carry a backpack. They're cheap and seem to work well so far. Plus, there's a little pocket in front for the lens cap I'm always trying to find a spot for.
http://a.co/agvFLCg
Just thought I'd share.
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