Tips to avoid having to worry about coins when traveling to Japan.
Divide the coins into two and manage them in two pockets.
This is the method that I, a Japanese person, also use.
Although cash is not often used these days, there are still places where only cash is accepted. Everyone has had the experience of having too many coins and bringing home a large amount of coins.
I think this way you can use coins and be able to pay quickly at checkout.