Nitrogen does two jobs inside a chip bag
The gas is not there merely to make the package look full. Before sealing, manufacturers flush the bag with nitrogen, pushing out much of the ordinary air. Because nitrogen reacts far less readily than oxygen, this modified atmosphere slows the oxidation of oils—the chemical process that can make chips taste stale or rancid.
The remaining gas also gives the flexible bag room to act as a cushion. When bags are stacked, jostled, or pressed during shipping, the gas-filled space can absorb some of that compression before the force reaches the chips. It is not a rigid protective shell, but it helps keep fragile pieces from taking every bump directly.
A small tradeoff across a long trip
A chip can be sealed in good condition and still arrive broken or stale if its package fails to protect it. Nitrogen helps address both risks at once: less oxygen means better flavor over time, while the inflated package offers a buffer in transit and on store shelves.
That buffer requires packaging space that contains no chips, which is why the bag can seem oversized for its contents. The space is doing practical work: it helps preserve the food and gives the chips a little distance from the rough journey from factory to pantry.
