“Cross-category,” in the sense that cookies and baby clothes are not generally packaged (or displayed) in milk cartons.
As discussed in our previous post, cookies are sometimes marketed as an accompaniment to milk. (And vice versa.) While Mother’s Cookies are not, themselves, packaged in a milk carton, the milk-carton-shaped P.O.P. display (above, left) poses the question: “As long as you’re buying milk, why not pick up some cookies?”
Beach Packaging Design