The guy who made it so difficult to open your bag of potato chips 
"The point here is that while technical options exist to prevent premature opening of the bag, such as reducing the initial air pressure in the bag, attempting to add this to the existing processing equipment would be a nightmare. So it was necessary to increase the seal strength."You could also reduce the air pressure in the factory, e.g. by building it in one of the aforementioned high-altitude regions.