GarlandAg2012 said:
I wouldn't use duct tape personally but it probably works. I just get a roll of saran wrap and basically shrink wrap the bottle. Use a hair dryer or stove to heat the shrink wrap to make it tight and it'll keep the cork forced into the bottle. Pack inside clothes and call it good. Bottle shippers would be good if it's a really nice bottle or you want extra insurance.
Just pack a roll of athletic tape. Do about 3-4 times around the stopper to hold it in place. It keeps the stopper from coming out and is easy to take off when you're home. Do it all the time when I travel.