Because rectangular Prisms are easy to carry and stack on pallets or bind them on pallets.
Boxes are usually rectangular prisms because they are easy to carry and are also good for storage. Not liquids however, but rectangular prisms are easy to pack and unpack from and into other objects because they interlock and overlap with themselves better than any other object.
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Rectangular prisms are efficient shapes for packing into boxes from shipping.
2 prisms
plateaus
All rectangular prisms have six faces, but if it's a RECTANGULAR prism, it's not possible for it to have six SQUARE faces, they only have two of those. In total, they usually have four rectangular faces and two square faces.
A rectangular prism is like a chalkboard eraser. A triangular prism is a pyramid. A pentagonal prism is a three dimensional home plate. None of them are the same.