Square wallets are commonly used to store paper money and coins. Some have slots to store credit cards and other small items such as loyalty cards or bus passes.
Use your wallet properly by only using each pocket or section for its intended purpose. If you put spare coins into the part meant to store paper money, it can make the wallet bulkier and you might have trouble closing it. Consider only carrying a very small amount of paper money, especially if you're trying to streamline your square wallet. A debit card can often be used instead of cash, and some cards feature protection against unauthorized purchases if they get stolen.