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der zur Zeit der Verpackung herrschende (Luft-/Aussen-)Druck
Explanation: I imagine something is packed into shrink foil, then this is packed again by using molding foam to pack it into a box.
Some weeks ago I drank from a water bottle while I was on a plane. The atmosphere and it's pressure being lower caused the water and air inside the bottle do use more space, in contrary when I was at zero above sea level the bottle shrank (when the plane landed again) If I imagine putting this bottle into molding foam at a heigt of 10 000 meters, and then transport it to just above sea level, the bottle would shrink again and leave space between itself and the molding foam. This would cause improper packing.