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The extra space is to cushion the chips during transport so you don’t have a pile of broken chips and dust. Typically they are also filled with nitrogen as it is inert and keeps oxidation and moisture in the bag to a minimum.
I’d like to see one of these charts that measures the amount of air in bags now vs. in the 80s or 90s. I could have sworn we had fairly full bags of chips back then, withouth them being reduced to rubble like so many people say.