The nature of wallets is changing rapidly.
In America, wallets are becoming thinner and more compact, as if there is a competition to make them as small as possible.
With the spread of cashless payments in Japan, the idea of minimalism has spread throughout society, and people are getting creative with their wallets.
Many people want to make their wallets as small as possible, so they use card cases or business card holders as wallets.
Certainly, if you use a coin case to hold coins separately, using a card case might be a good idea. Personally, I think this use of a card case and coin case is very nice.
By the way, in America, tipping is a custom, so people don't usually carry coin purses.
It seems to be good manners to give tips without being noticed, so they always carry them in their pockets. I've never seen anyone take a coin out of their coin purse to give a tip.
