For your information standard internal container dimensions:-

40ft std - 12.00m L x 2.33m W x 2.35m H(end door aperture width 2.28m hieght 2.26m)

40ft hc  - 12.00m L x 2.33m W x 2.65m H(end door aperture width 2.28m height 2.56m)

20 std   -   5.87m L x 2.33m W x 2.35m H(end door aperture width 2.28m height 2.26m)

40ft std cubic capacity - 66.83m3
40ft hc cubic capacity  - 75.32m3
20ft std cubic capacity - 32.85m3