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Whereas some video games give you a Wallet of Holding in which you can eventually stash more money than you ever could use, other games aren't so generous about letting you have the money you need to buy that really useful item, no matter how good you are at beating the coins out of Money Spiders. When there are useful items on sale for more than your standard wallet can hold, you need a Wallet Upgrade, which can be any sort of item (which you may have to buy at no small cost) or even an in-game event that raises the amount of money you can carry on yourself. Related to Cap, which usually describes a hard limit.