First, milk cartons are not cuboid.Cuboids can be stacked, or grouped together, to make larger cuboid shapes - without wasted space. This makes for more efficient transportation.
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No.
A letter (a sheet of paper in an envelope).
The reason a milk carton (which has a square footprint) looks like a prism is that when it is viewed from the the side, there will always be a face of the carton hidden from view. A maximum of three sides will be visible (but only one if it is viewed on a line of sight perpendicular to any face or side) when a viewer is looking at the carton. The three-sided solid figure that it looks like is called a prism.
it will be hot, taste bad and might change colors or grow mold
A cuboid is 100% of a cuboid and 0% of any other shape.