There are several reasons why potato chips bags are filled with nitrogen gas.

Protection from bacteria. Bacteria need oxygen to live and multiply, but if all the oxygen is removed and replaced with another gas, this won’t happen. This means that mold and other unpleasant things won’t appear on the potato chips.
Protection from moisture. Water is another foe of crispy chips. Nitrogen displaces water vapor, and when we open the package, we experience the chips as tasty and fresh as they were immediately after preparation.
Maintaining their structure. Finally, nitrogen helps chips get to the store shelves and not be broken because it acts as a shock absorber. If not for the nitrogen, potato chips would arrive to buyers as crumbs.

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