I got this to keep my memory cards in order and it ticks the box. I don't have many of these yet, but even two or three can be a problem for them not to slip into a camera bag. It's small and only holds 2 sleeved cards, but since it acts like a sleeve you don't really need more sleeve space. I attached the strap more so I can pull it out of my pocket than any other. another reason. I think you could attach it to a belt but I don't see the need for it.
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