The internal dimensions of a 20-foot standard container are about 5.898 meters long, 2.352 meters wide, and 2.385 meters high.

　　Its volume is about 28-33 cubic meters. However, in the actual loading, due to the different shape of the goods, packaging and stacking methods, it is usually unable to fully fill this space.

　　For example, if the cargo is packed in regular shaped cartons that can be tightly stacked, it may be close to 30 cubic meters. But in the case of irregularly shaped goods that cannot be tightly stacked, such as large machinery parts, the actual load may be much less.

　　In addition, it is also necessary to consider that the weight of the cargo cannot exceed the maximum load limit of the container.