Why is it impossible to ever get a full bag of potato chips these days?

Why is it that,even when you buy a large size bag of potato chips, the bag is NEVER full all the way to the top? The chips are always in the lower half of the bag and the top half is just all air. Companies should stop doing this and just fill the bag to the top, and leave only enough room for the bag to be sealed... show more Why is it that,even when you buy a large size bag of potato chips, the bag is NEVER full all the way to the top? The chips are always in the lower half of the bag and the top half is just all air. Companies should stop doing this and just fill the bag to the top, and leave only enough room for the bag to be sealed shut. When you buy a car, they don't give it to you with just 3 tires and no engine, right? You get it with all tires and an engine. When you buy a bag of chips, it should be full to the top, not just mostly air.
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