A couple of years ago, two of us brought back about 24 bottles of wine. We had six each as a carry-on, and 12 in a special, padded bag that was checked. This was with Air France, and there was no problem.

Just remember, if you are going to check the wine, make sure you obtain a true shipping box and appropriate bottle separators. Otherwise, you may not have anything but broken glass to show for your efforts.

(A case of twelve bottles is 9 liters, not 8)