Originally Posted by
pencereamelesi
It depends to your destination.
If you have a connection flight within the European Community or United States, it is not permitted to carry any previously purchased duty-free products (over 100ml) as hand luggage even in sealed bags
Link:
Not sure what they mean by that, but last month I carried two 1-liter bottles bought in FRA through security at IST with no problems whatsoever.
Shuly