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.
It depends on the pallet. I just did my project on unit loads in wine cellars and the tipe of pallet I found can take up to 72 boxes (6 bottles) of wine. Dimensions were 4x6x3 (boxes). Hope it helps.