What is the best (most secure) way to pack wine in luggage that you intend to check onto a flight?
In a pinch, you could simply wrap the bottles in several layers of newspaper, then place them amongst some clothes–the thicker and more padded the clothes, the better. Try to pack the entire suitcase relatively tightly; you don’t want the bottles to move around during their flight if you can prevent it.
A better solution is to swaddle the bottles of wine in bubble wrap. Bubble wrap is easy to find these days. Office supply stores and even Wal-Mart carry it. As an added precaution, you can then take the bubble-wrapped wine bottles and place them in a large Ziploc bag. If you are paranoid, you can not only zip close the bag’s opening, you can cover it over with duct tape to help guard against a major wine spill should a bottle break en route.
We know many people who regularly bring back wine and other alcoholic beverages from their travels, and we have heard of very few problems. So … pack those bottles as advised above, and then relax your mind. They’ll arrive in good shape at your destination, ready for you to enjoy.

