How do you think those fragile potato chips manage to reach your Cheetos stained fingers without breaking?
The air is in there so that when you buy a bag of potato chips with my money, your precious little snowflake fingers don't have to reach into a bag full of broken potato chips, you ignorant stooge.
Yes, grasswire, and all that air means a huge amount of shipping volume and handling cost has to used by that one bag to show up on the shelf of the store were shopping at.