The effective outside dimensions (length and width) of transport pacckages shall be obtained by multiplying or dividing the standard plan dimension by an integer. The module standard plan dimension is 600 mm x 400 mm (23.62 in x 15.75 in).
ISO 3394:1984 history
2012ISO 3394:2012 Packaging - Complete, filled transport packages and unit loads - Dimensions of rigid rectangular packages
1984ISO 3394:1984 Dimensions of rigid rectangular packages; Transport packages
1975ISO 3394:1975 Dimensions of rigid rectangular packages — Transport packages