When it came to reducing slack fill, Fritos came out on top, with just 19% of the bag taken up by nitrogen gas, and Pringles followed closely behind with 28% slack fill. The chips to avoid if you're not a fan of slack fill are Stacy's Pita Chips and Ruffles, which were tied at 50% slack fill, and Cheetos, which had a whopping 59% slack fill per package.