The volume of the original Captain crunch box is:
13 x 3 x 8 = 312 cubic inches.
Volume is given in cubic units.
If the volume is scaled down by 1/10
The cubic value is 1/10^3
Multiply the original volume by 1/10^3
1/10^3 = 0.001
312 x 0.001 = 0.312 cubic inches.