Question 1043220
It looks like the volume of the plastic must
be at least as big as the volume of the box
in order to hold the cereal.
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Volume of box:
{{{ 14.5*3.333*20.125 = 972.611 }}} in3
Volume of plastic:
{{{ 13.5*4*21 = 1134 }}} in3
The cereal will fit in the plastic because the volume 
of the cereal is actually smaller than the volume
of the plastic