Brand: Flo Fast Fluid Transfer Pumps
This 10 1/2 Gallon yellow plastic utility jug measures 31 inches tall (including cap) by 12 inches square.  Dual handles for easier carrying.  A manually-operated vent valve in one handle allows air in to replace the liquid being pumped out.*  An O-ring seal in the cap prevents spillage and vapor escaping, but these jugs do not meet EPA regulations for portable fuel containers.  Sold individually.  
* The venting system is not automatic. You must open the vent valve to equalize pressure and close it to prevent evaporation.  Vent design may vary from photo.