So, I am confused about what the procedure should be. I have always been told to drain all of the air from any bottle when shipping it. I was just told by a fellow seller something very different. They told him at royal mail that the bottle shouldnt be full or empty. In order for it to be safe it has to have some air in it (if I understood him correctly). What is the truth? I dont want it blowing up the next time I ship one!