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If the packaging was porous then it couldn't contain the vacuum pressure anyway. It's this that holds the smell in this case. Another point is that the pressure doesn't pull inward as such, it pulls outward equally in all directions. If you think about it, things expend in a vacuum, not compress. Think of pulling the air from a jar containing a marshmallow while it expands to fill the jar or an astronaut without a suit having their blood try to boil from their body. What's inside actually wants to travel outward from itself, if that makes sense
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