It's not as scarey as it sounds. For those that fly much, most all of us have had a bottle of something leak in our luggage. The pressure differences the bottle sees is why. The less volume of air in a container the less pronounced the affect will be, so travel with full bottles of stuff and, just in case, stick them in a ziplock bag to protect the undies! If I was going to fly with fish, I would put them in a rigid container to prevent volume change with pressure. The pressure in the sealed container will remain at whatever pressure was present when the container was sealed. You might have a little trouble getting the lid off at your destination if it is a significantly different altitude than where the fish were packed though!


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