问题
Their main benefit is flexibility. As they have no side walls or roof, they can accommodate “out-of-gauge” (OOG) consignments of almost any shape or size.
Their heavily reinforced floors mean they can often accommodate heavier loads than a standard shipping container, too. A third advantage is that collapsible flat rack containers occupy significantly less space when not in use compared to standard shipping containers.
你知道吗？
The biggest benefit is flexibility. A flat rack can carry cargo that is too wide, too tall or shaped too awkwardly for a standard container, while still fitting into established transport systems. 
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