. . . "(d) For the purposes of this definition, packaged food in hermetically sealed containers processed by heat to prevent spoilage; packaged pickles; jellies, jams and condiments in sealed containers; bakery products such as bread, rolls, buns, donuts, fruit-filled pies and pastries; dehydrated packaged food; and dry or packaged food so low in moisture content as to preclude development of microorgani" .