Business and Professions Code § 23400

An on-sale general license authorizes the purchase and possession of distilled spirits in packages which packages shall conform with standards of fill for distilled spirits in all respects to the regulations issued pursuant to Federal Alcohol Administration Act (27 U.S.C. Secs. 201 et seq.) and any amendments thereto. An on-sale general license shall not authorize the purchase of distilled spirits in packages containing less than six ounces or whiskey, gin, or vodka in packages containing one-tenth gallon.