Originally Posted by
simong
There is no domestic liquid restriction in Australia, so assuming the connection SYD-MEL is a domestic one you can just carry on, no issues.
Exactly. The OP just needs to remember that there is a limit of 2.25L of alcoholic beverage which can be brought in duty free. You also have to collect you bags and clear customs in SYD so placing the bottle in you checked bag is an option if you want.