The messenger bag is similar in function to a backpack, ensuring comfort for those carrying heavy and/or large items while allowing for easy retrieval of items.

Compared to backpacks, it is easier to place and remove textbooks, laptops, and supplies because they can be easily transferred to one side of the body, providing better accessibility. Postman bags are more weather resistant than leather backpack style backpacks.At the same time, mailman bags are also regarded as fashion accessories, becoming accessories used by trendsetters to match clothes.