Two bills fit if you take out the middle part to wrap the bill. It's a very close relationship and I wouldn't recommend trying to match two accounts if you access them regularly. I was looking for something to keep rarely used emergency cash on my keychain and this fits the bill. It is a bit troublesome to roll them up and you need to roll them up tightly. It's strong, I don't expect this to fail, but I've tested it several times since adding it and it's holding up very well.
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