In general foods, have to stay isolated, from other bacteria that could live in the bag. When the cell doesn’t get oxygen or other process components for processes like respiration, it can not survive. It’s like making a ceiling to the rain forest, to kill the trees, because they wouldn’t be able to make photosynthesis. All these processes are essential for all mikro to makro species, getting energy to stay alive. If we open the chips bag, bacteria could potentially live and spread inside. The air is not dangerous for the chips. It’s the bacteria, which could respirate the air
*”…there is air in the bag…”*
Your premise is wrong. There’s no “air” ^oxygen in the bag until you open it. Bags are factory purged/filled with Nitrogen specifically to keep the contents from oxidizing in transit & storage. They’re also filled out fully to protect the contents from damage in shipping. Once you open it you’ve now exposed the contents to both oxygen and moisture, both of which have a negative effect on the freshness of the chips inside.
Humidity in the sealed bag is very specific and limited to the captured volume of air. This means the chips don’t absorb moisture from the surrounding air and go stale.
Once you’ve opened the bag, there’s significantly more moisture available for the chips to absorb (from the whole air supply around them in the house, even if you roll the bag tightly.
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