The one piece of Tokyo travel advice I never got

You need a doohickey. It's like an app, but for your body.

Here’s my one piece of Tokyo travel advice: get a doohickey.

The doohickey is whatever device carries cash, cards and coins and offers quick access to each. One motion to pay, pass a ticket gate, store or count change and cash. The coin purse I bought was too slow, so I combined it with a card carrier + lanyard + reel thing I bought at the Muji next door…