Containers are designed to be stacked in high columns carrying heavy loads. Containers come with 8 Corner Casings which are the only points where a Shipping Container is meant to be anchored. This makes a container can only rest on it’s 4 bottom Corners and can only support loads from above on it’s 4 top corners. Everything else on a container is not meant to carry any significant load. This mean you can only stack containers in configurations where all for bottom corner casings of the upper container are supported by four top corner casings of lower containers. This results in many desirable stacking configurations being impossible from a stability standpoint.