For a passenger aircraft you can have up to 5 L per container, but it has to be in a metal or plastic container, which then has to be packed inside a fibreboard box, metal drum, etc. that has to be UN specification. If you just have a single packaging, i.e just the fuel in a drum or jerrican then you are restricted to a cargo aircraft, i.e. no passengers and you can have up to 60 L in the container, but it has to be UN specification. There's no limit on the number of individual containers on either a pax or cargo aircraft. This is the requirements for the IATA DGR
As has been provided CASR 92.175 provides relief for private operations and then 92.185 offers relief from the provisons of the DGR for operations within Australian Territory to allow for petrol and aviation turbine fuel to be in in steel or aluminium drums with a capacity up to 220 L on a cargo aircraft.