问题
A 20ft container is half the length of a 40ft, but both are 8ft wide and 8ft 6in tall (standard) or 9ft 6in tall (High Cube). The 20ft holds 33 cubic metres of cargo. The 40ft holds 67 cubic metres. The 40ft is more cost-effective per cubic metre to ship and rent.
你知道吗？
A 20ft container usually reaches legal road-weight limits before it runs out of space. A 40ft container often reaches its volume limit first. That is why dense cargo tends to favour 20ft units, while lighter cargo often moves in 40ft containers. 
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