Originally Posted by
capetonian
Apparently the rule is as follows: When transiting (anywhere in the world) you will be allowed to take your liquid duty free purchases in your hand-luggage provided it is in the original sealed bag with the invoice sealed in as well and it is within 24 hours of the time of purchase.
That is definitely not true. Try bringing any liquids duty free (over 100ml) through transit security at SYD, AKL, etc and it will be confiscated.
Intra-EU has special rules about duty free liquids, as do some other countries. But the rules are far from uniform (eg only duty free bought in certain other countries is allowed) or universal (many countries do not have a duty free liquids exemption at all).