Abstract: A container vehicle for fluent contents, that is to say a container in which such contents can be securely held when in transit. It comprises a cylindrical vessel arranged with its axis level and having axially-disposed ports, valve means to prevent an above-axis height load within from spilling out of the ports, and sealed joints halves associated with the ports whereby to make sealed joints between those ports and input and output delivery pipes. The vessel can be rotated by external means and contains at least one helical vane within it which propels contents axially when the vessel is so rotated. The ports may coincide with bearings to support the weight of the vessel. The vehicle may be for the transport of powdered material, to be delivered into and discharged from the vessel when fluidized by pressurized air, in which case angled delivery and discharge spouts within the vessel may suffice as the valve means.