The principal display panel shall be the part of a label that is most likely to be displayed, presented, shown or examined under customary conditions of display for sale. Where packages bear alternate principal display panels, information required to be placed on the principal display panel shall be duplicated on each principal display panel. The principal display panel shall be large enough to accommodate all the mandatory label information required to be placed thereon by this chapter with clarity and conspicuousness and without obscuring such information by designs or vignettes or crowding. In determining the area of the principal display panel tops, bottoms, flanges at tops and bottoms of cans, and shoulders and necks of bottles or jars shall be excluded. The principal display panel shall conform to the following size requirements:
7 Pa. Code § 1.245