When cubes are flat packed they always have four in a row then one square on each side. (Admittedly this allows for tabs for connecting sides.) So they fill a three by four rectangle.
Are these different flat packs more efficient in any way? Obviously they take up 3x3. But what about tiling the flat packs?
Topologists might make cubes that way but not logistics packaging makers due to the added performance requirements on real-world boxes in conjunction with the anisotropic nature of corrugated cardboard and anisotropic nature of the world (gravity).
It seems more common to use a 1x4 strip for the four sides flanked by 1/2 x 1 flaps on both sides of that strip. That uses a total of 2x4 units of material (plus a little for a flap to hold the sides together) but it also ensures that the orientation of the corrugation can support stacked boxes, offers a double-thick bottom for damage resistance, has four folded sides on top for better stacking strength, and is perfectly tiled from a larger roll of corrugated stock.