This is a shoulder bag from Seria, a 100-yen shop. Depending on the size, a cell phone can fit. It's a small shoulder bag that can also hold card cases and commuter pass holders. It's convenient to put your card case, commuter pass holder, and coin purse in this small shoulder bag when it's difficult to take them out of your main bag. I've used it a few times. If that's okay with you, please consider it. Individual sales are OK.