2 cu feet is a unit of volume commonly used to measure the space inside a box or storage area. One cubic foot is equivalent to a space that is 12 inches by 12 inches by 12 inches. Therefore, 2 cubic feet would be twice that volume, which is often useful for calculating shipping costs, as carriers base some of their rates on volume. For example, a box with 2 cubic feet of space would have dimensions that add up to around 24 inches by 12 inches by 12 inches, depending on its shape.