At which temperature does beer freeze? It should be quite a bit lower than water, because it's carbonated and it has alcohol in it...
edit: well, it seems freezing point of beer is ~ -5°C, so it wouldn't be too much of an advantage. And there seems to be some fun with almost-frozen beer
I think that's the cheapest and easiest way to transport them.
About freezing or exploding bottles:
This is usually not possible in passenger aircrafts.
Because of the pressurized cabin and the altitude compensation you have the same air pressure in the passenger cabin and in the cargo-hold.
And it's not like it's freezing cold in the cargo-hold else they couldn't transport living animals like cats, dogs, etc.
So the only problem is the guy who throws your luggage and the customs duty if you transport more then allowed and when they'll catch you
The freezing points for various types of German beer are stated as follows:
malt beer, ordinary: -1.92°C
Vollbier, pale: -2.03°C
Radeberger Pilsener Export: -2.22°C
bock beer, pale: -3.07°C
Well, the beers all made it unbroken and unfrozen.
i put each bottle into a ziplock bag, then dropped it into a sock. i pulled the sock all the way up, gave it a twist and then looped the same sock back again. i did it again with another sock to give 4 sock layers.