A Shoulder bag can be referred to as a messenger bag, courier bag, or satchel. A messenger bag (also called a courier bag) is a type of sack, usually made out of some kind of cloth (natural or synthetic) some leather and canvas, that is worn over one shoulder with a strap that goes across the chest resting the bag on the lower back.A satchel is a bag, often with a strap. The strap is often worn so that it diagonally crosses the body, with the bag hanging on the opposite hip, rather than hanging directly down from the shoulder. They are traditionally used for carrying books. The main difference between a satchel and a briefcase is that a satchel is soft-sided. Also, satchels often have straps while briefcases usually don't. Here at Outdoor Shopping we offer the best high quality shoulder bags for rifles, books, clothing, ammunition and clips just to name a few. Great for walking, clubs, running, cross country biking, fixed gears, mail, library, girls, boys, men, and women.