The main difference between messenger bags and backpacks is that messenger bags are crossbody bags or shoulder bags whereas backpacks have two shoulder straps. Messenger bags where originally designed for carrying small items where easy access was needed. As loading out of the bag is easy due to the wearer being able to swing it over there shoulder. A backpack however needs to be taken off. Because the main compartment is close to the body with messenger bags, it makes it easier to quickly search for money and to grab other light essentials that the bag fits. The single strap that usally comes on messenger bags also offers a different style to a backpack with a slim profile. However, occasionaly this may be referred to as a black messenger backpack or deck bag.