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Coins seem to be the one form of money nobody wants. They're heavy and not worth much. Many people have a jar or a piggy bank or some sort of container they throw spare change in each day. I use an old acrylic fish tank I got back when I was in college, like this one:
For years, every day, when I got home, I would throw all my change into it. I never managed to fill it, which was probably a good thing. The fullest I ever got...