The Chinese are very keen on preventing shoplifting, so in many stores you can't take any sort of backpack or bag (even a plastic shopping bag from another store) in, and you have to leave it at the entrance. Fortunately, many of the larger stores have a very user-friendly and convenient method for doing this.
You press a button, a locker opens, and a reciept with a barcode prints out from the panel in the middle. You put your stuff in, close the door, which locks, and you leave. When you come back, you hold the barcode up to the scanner right below the printer, and the locker opens! This is easy and so simple, I cannot imagine why these things aren't all over America.
Why don't they have this at the gym so you don't have to carry your own lock or a gym locker key? What about stores in America? or bus stations and airports (there it may be the terrorist paranoia that prevents leaving anything for any amount of time)?
Basically, why should there be any situation in which a nation that is much poorer and somewhat less technologically advanced have nify gizmos that we don't?