(a) Nonfat dry milk in commercial bulk containers bearing an official identification shall meet the requirements of U.S. Extra Grade or U.S. Standard Grade.
(b) Regular nonfat dry milk in consumer size packages which bears an official identification shall meet the requirements of U.S. Extra Grade. In addition, the nonfat dry milk shall be sampled and tested in accordance with §§ 58.244 and 58.245.