I use mine as an ear phone case and it works quite well. It’s easy to open and close. I do notice the hole where the metal pin pushes through gets bigger with use, but that doesn’t bother me. As for storing credit cards.... I put a store reward card next to it to show that the card can fit. If you don’t mind stacking your credit cards on top of each other, you should be able to fit more than 6 cards inside. However, I think it is bad for the credit cards if they are stacked together without any divider.
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