I had about 10ml or so left in my old bottle of Acqua Di Gio 2 years ago. I went on a flight and put the bottle in my checked luggage. When I got off the plane and opened my suitcase later, I instantly smelled Acqua Di Gio. The pressure in the plane had caused my cologne to explode out of my bottle. I don't know if it all came out the sprayer b/c the bottle was in perfect condition, but it was ALL gone. I've never had it happen before or after that. I think it was b/c it was so low on juice. I don't know how to pack it without it getting affected by the unpressurized cargo hold.