Section 4, paragraph 3, point 2 says that milk subject to 'aseptic processing' (defined earlier in the same doc, as milk that can be stored without refrigeration in a hermetically sealed container) must be labeled with the words 'keep refrigerated after opening'.
I'm not sure where you live but, if in the US, you room-mates milk packaging is contrary to FDA regulations. See this doc: https://www.fda.gov/downloads/Food/GuidanceRegulation/UCM209...
Section 4, paragraph 3, point 2 says that milk subject to 'aseptic processing' (defined earlier in the same doc, as milk that can be stored without refrigeration in a hermetically sealed container) must be labeled with the words 'keep refrigerated after opening'.