This article is from the Food Science FAQ, firstname.lastname@example.org (Paul E. J. King) with numerous contributions by others.
The primary packaging of the food contains it; preserves it and
protects it from contamination or damage; carries the identification
and description of the contents; provides visible evidence as to
whether the package has been tampered with; and reduces household
waste by providing only the edible part of foods.
The outer packaging (e.g. paperboard cartons) is an essential
means of transporting to retail stores large quantities of the packs
for stacking on shop shelves.