The packaging must ensure that the cargo does not, in any way, pose risks to other consignments, the service provider or the environment. The items inside the package must be protected against loss and damage in case the package is rotated in any direction, other packages are loaded on top of it, or when the package is jolted during loading or transporting. The empty space inside the package must be filled with filling material so that the transported item does not move inside the box and the package retains its original shape.

More information here.

See also