A shotgun bandolier is a shoulder belt with a series of loops in it. Each one of these loops can hold a shotgun shell. The belt basically wraps diagonally around your upper torso in a loop, so that the belt goes over your chest, around your shoulder, diagonally down the back and up towards your chest again. Most belt models put the loops for the shells on the front of the belt, which is the part that goes over your chest. That way you can easily access the shells any time you want to use them.