Three or more different sizes of the same item or commodity which must be enclosed, each smaller piece within the next larger piece, or three or more of the items must be placed one within the other so that the top item does not project above the lower item by more than 1/3 of its height. Nested Solid: Three or more of items must be placed on or inside the other, so that the external side surfaces of the top item is in contact with the internal side surfaces of the item below, and the top item does not project above the next lower item by more than 1/2 inch.