Abstract: A pack of registering plastic T-shirt bags in which the walls of each bag are provided with registering central tabs projecting into the bag mouth, the tabs each having a rack retainer mounting orifice comprising a lower transverse cut portion extending between points spaced inwardly from the side edges of the tab with one end of the cut portion curving back and upwardly to extend toward, but terminating before reaching, the upper edge of the tab; and the other end of the cut portion also curving back upwardly and terminating in a segment of the cut extending back parallel to the lower transverse portion for a distance less than half the extent of said latter portion; thereby, the tabs of the bags may be mounted on a rack retainer by passing the retainer through the lower transverse cut portion of the mounting orifice.