The bag used by the postman is called a postman bag, and the mouth is open, making it easy to put in and take out deliveries even while riding a motorcycle or bicycle. We have put such a Postman bag into a casual messenger bag style. The flap can hide the things inside, which also plays a role in crime prevention, but the flap is in the way and it is difficult to see inside, and it is necessary to lift it, so one hand is blocked. The "Messenger Postman" has an original design of short flaps and flaps that rise up, realizing a structure that makes the contents easy to see and take out. This bag is designed to be equipped with a dedicated wallet (DUO wallet). By attaching the wallet to the top of the bag, there is no need to search for and take out the wallet from the bag. You can make smooth payments at any time.