The Rover fits nearly 4 ½ cups of food when fully packed.   It will accommodate a wide assortment of foods that make a very healthy lunch for most kids and some adults.  Many people find that they can pack more food than they originally thought. This is because the lunchbox lid is raised so you can pack the tray high with food.If needed, the Big Dipper can be used independently of the Rover to store a snack outside of the main meal time.  It fits in the Carry Bag's snack pocket.