Similar to the backpacks, the messenger bags are suitable for carrying heavy items,  which have become fashionable in urban environments, Many students make use of them for fashionable and functional purposes, it is much easier to place and remove text-books, notebooks and supplies from a messenger bag because they lie on the side of the body, granting the wearer better accessibility.

usually the materials used in the messenger bags are often more durable, which could be durable polyester, nylon, cotton and canvas, Messenger-Bags.html there are some messenger bags for your reference.

Your sincerely,

Ruby