See page xxii of Nomenclature 3.0 for advice about cataloging product packages. The convention noted there is to use two separate object terms — in this case, “jar” and “package, product” — so that the object is classified both as Container and as Merchandising T&E. The contents would be noted in another field, such as a subject field. If you are using Library of Congress Subject Headings as your lexicon authority in such a field, then you’d enter “Metal polishes” there.
