Isiqukathi yisitsha esijwayelekile esisetshenziselwa ukuphatha impahla, sihlukaniswe sibe yisitsha esijwayelekile samazwe ngamazwe kanye nesiqukathi esingajwayelekile.
Ukuze kube lula ukubalwa kwenani leziqukathi, ungathatha isiqukathi esingu-20ft njengebhokisi elijwayelekile lokuguqulwa (okubizwa ngokuthi i-TEU, Amayunithi Alinganayo Amafidi Angamashumi Amabili).