31 Pa. Stat. § 42
Hereafter it shall be lawful for any person, copartnership, association or corporation to sell or offer for sale at wholesale or retail in this Commonwealth, fruits and vegetables in original unbroken standard containers, as herein defined, but sales in such original unbroken standard containers shall be lawful only if there shall appear thereon a plain and conspicuous statement showing correctly the quantity of fruits and vegetables contained therein in terms of weight, measure or numerical count, and only if the containers shall have been filled or packed in accordance with good commercial practice. If the contents of an original standard container are broken for resale at wholesale or retail, or if fruits and vegetables are sold in any other manner than in original unbroken standard containers, then such sales shall be lawful only if made by weight or numerical count and in no other manner whatever. It shall be unlawful for any person, copartnership, association or corporation to sell or offer for sale, at wholesale or retail, any fruits or vegetables the weight of which is less than that represented.
31 P.S. § 42