§ 231

The declaration of net quantity of a consumer prepackaged food must be shown

(a) in the case of a consumer prepackaged food that is listed in the document entitled Units of Measurement for the Net Quantity Declaration of Certain Foods, prepared by the Agency and published on its website, as amended from time to time, by volume, weight or numerical count in accordance with that document; or

(b) in the case of a consumer prepackaged food that is not listed in the document referred to in paragraph (a), (i) if the food is liquid, gas or viscous, by food volume, or, if the food is solid, by weight, or (ii) if the established trade practice in respect of the food is to show its net quantity in a manner that is different than what is required by subparagraph (i), in accordance with that established trade practice.