Well that's 1 day of use and one card fell off. I don't know if I didn't have enough cards, but it's very frustrating. I get something else that was a big disappointment.
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Pros
Most "minimal" wallets are not minimal. This one is and still is right up your alley.
Cons
That's exactly what I needed, simplicity, but by the end of the year, orange and blue will become black and gray.