But the square box and flat base do have some differences. For starters, the square box is generally no more than seven weeks long, while the flat base can be very long — a year or more.

Wrigley gum will soon come in flat, square boxes, replacing the familiar slim rectangle. Business. Square Boxes Ahead for Wrigley Gum. March 13, 2008 6:00 AM ET. Heard on Morning Edition.