Acquiring unused shipping units can be a surprisingly straightforward process , but grasping the fundamentals is important. Prices fluctuate significantly depending on the size , type , and state . Standard sizes include 20ft boxes (roughly 6.03m x 2.44m x 2.59m) and 40ft units (roughly 12.03m x 2.44m x read more 2.59m), with 40ft extended options