Inhloso yesikhwama somoya se-dunnage ukuvikela impahla nokudala indawo enkulu ngesikhathi sokuthutha. Lokho kungaba isitsha solwandle, inqola yesitimela, iloli, umkhumbi, noma i-intermodal. Izikhwama ze-dunnage zizofakwa ezikhaleni noma endaweni engenalutho phakathi kwempahla bese zigcwaliswa ngokucophelela ngomoya ocindezelwe. Izikhwama zomoya ezilukiwe ze-PP zilula, azingenwa manzi, futhi zingaphinde zisetshenziswe ngo-100%.
