Originally Posted by
spin2nd
For people checking only a bottle or two check out the wine skin...I've had great luck with them. I put the bottle in one of these and stick it in the middle of the bag amongst my clothes to avoid impacts. Its basically a tailored bag made of bubble wrap that seals at one end -- if something does break a bottle there's pretty much no way for it to leak onto your stuff.
http://www.wineskin.net/
I'll have to second the recommendation for the Wineskin. I use these quite frequently when transporting wine in my checked luggage. I've had some bottles leak into the sealed skin, but never had any leakage out of the Wineskins. Total Wine sells them rather inexpensively.