Transport vessel provided with two (or three) trees, on one of which they posed as a corbe (corbes) signal from which it was named corbita.

Cargo ships were shorter and wider than warships: their length was about three times the width. The bow was rounded and often equipped with a device to improve the quality of navigation; the stern could end with a swan head backwards and was often enriched by decorations and architectural motifs. Thanks to the strength of the wind, which was to inflow a large square or trapezoidal sail secured to the master shaft in the central part of the keel, these vessels were able to carry a considerable cargo, varying from 3000 to 10000 amphora (from 150 to 500 tons ). The ships were carrying a second forward tree and, sometimes, a third one. All the ships were nevertheless equipped with oars, mainly used in landing maneuvers: the number of rowers was small because the space was mostly intended for cargo.