paper comes in cartons.. 10 reams to one carton, 10 cartons to a flat, (10% discount 3 or more flats!)

and eggs come in cartons.. (usually a dozen, but fancy organic eggs laid by free range chickens are sold in packs of 8)

and i would still call the waxed cardboard quarts and half gallons of milk containers cartons, (but not the plastic jugs. but i don't use much milk, (i drink coffee black) so i buy 1 quart cartons.

a quick check shows carton is from the italian, for cartone, based on the italian carta (cardboard, paper) and is defined as a cardboard box, especially a large one for shipping things.

Most NY eggs are still packed in packaging that looks like, a soft paper/ cardboard felt. some brand come in fancy styrofoam boxes.