Posted By jon_hall Although i don't have the answer for you i used to work for a logistics company. Best advice would be to phone a container shipping line and ask them or a major port office. They would have a far better idea than most as this is their daily job. I can however say that the container yard i can see from my office window is stacked four containers high.

Posted By CAW See HSG78 - Warehousing and Storage Stacking palletised loads (block stacking) 614 Avoid stacking palletised loads of cartons and packs that are capable of being crushed, as the strength and stability of the stack cannot be maintained. Loads that are capable of being stacked directly on top of each other should be positioned on a firm level base. It may be necessary to provide additional packing on top of the lower palletised load, depending on the characteristics of the load and design of the pallet. 615 Generally, such stacks should not be more than a 4:1 ratio between height of stack and the minimum depth/ width of pallet. Four loads high might also be considered a maximum due to the potential problem of crushing the goods on the bottom pallet. In some circumstances, dependent on the height, strength and stability of the loads, taller stacks may be built. The maximum permissible height may be up to six loads high, provided that the pallet itself and the packaging of the stored goods

Posted By A Campbell Undoubtedly the maximum height would take into account various factors, such as: Ground conditions and weight loading Stacking capability - slots for integrating or flat stacking? Type of vehicle capable and reach/weight, method of lift, restrictions, maneuverability? Protection of high winds Electric power lines Do you need to access once stacked? Perhaps you would be able to get advice from the container owner/shippers or contact a port authority? And of course a risk assessment for safe stacking, movement and storage