3 Pa.C.S. § 5729
(a) General rule.— A food shall be misbranded:
(5) If it is in a package that does not bear a label containing:
(ii) An accurate statement of the quantity of the contents in terms of weight, measure or numerical count.
Reasonable variations are permitted and exemptions as to small packages shall be established in regulations promulgated by the secretary.
(7) Unless its label bears the following:
(b) Exceptions.— The provisions of subsection (a)(1), (2), (3), (4), (5), (6), (7), (8), (9), (10) and (11) shall not apply to the following: