they are 4X6, 2 way, but I bought the new Pioneer 4X6X3, and man they kick rear!
The length, breadth and height of a cube are all the same so clearly the shape in question is not a cube. It is, in fact a cuboid and its volume is 4*6*3 = 72 cubic feet.
Most standard wine bottles hold 750 millilitres. Diameter, height, and shape vary according to tradition and the region in which the wine is produced. Look in a wine shop window and you will see some of the various shapes.