Ore-bulk-oil carrier
（重定向自OBO carrier）
![The OBO-carrier Maya. The picture is showing both the cargo hold hatches used for bulk and the pipes used for oil](/Images/godic/202501/30/Maya_OBO_carrier_20324.jpg")
An ore-bulk-oil carrier, also known as combination carrier or OBO, is a ship designed to be capable of carrying wet or dry cargoes. The idea is to reduce the number of empty (ballast) voyages, in which large ships only carry a cargo one way and return empty for another. These are a feature of the larger bulk trades (e.g. crude oil from the Middle East, iron ore and coal from Australia, South Africa and Brazil).