first we have to take sperm out of your dick
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Make it infinitesimally small.
It makes it easier to put the boxes into outers for shipment (the outer will also be a cuboid and will have an exact number of cereal packets in it without any wasted space, and the cuboid outer is easier to stack for transportation);The cuboid cereal packets stack easier on the shop shelf;The cuboid cereal packets stack easier in the cuboid cupboards of [most] houses.
A cuboid is 100% of a cuboid and 0% of any other shape.
The concept of a perimeter does not make sense for a solid object.