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Some companies that manufacture packing cubes are Red Oxx, Tom Bihn, and Eagle Creek. Packing cubes are readily available for purchase through Amazon.
The plural of packing list is packing lists.
As in "where are the packing lists?".
The answer probably is 3*2*4 = 24 unit cubes
but you could also do it with 10 cubes: 2 cubes of size 2*2*2 and 8 unit cubes. The question does not require the cubes to be unit cubes.
3 cubes x 3 rows = 9 cubes
24 cubes would be it.