[1] There are flat racks in the standard sizes 20′ or 40′, and also in the dimensions of high cube containers.
[3] However, there is a high risk of damage to the cargo during shipping compared to fully closed containers.
This risk is partially mitigated by placing flat decks in the cargo hold of a ship, or with closed containers used as protective barriers on the sides.
[4] Some flat racks can be folded when empty, allowing five units to be stacked in the space of one regular container.
[5] The ends may also be folded to hold over-length cargo or to serve as a ramp.