Is it OK to eat crisps that are 3 weeks out of date?

Eating crisps that are 3 weeks past their expiration date is generally safe if they have been stored properly and show no signs of spoilage, such as an off smell or unusual texture. However, they may not taste as fresh and could have lost some of their quality. Always check for any signs of mold or an unusual appearance before consuming. If in doubt, it's best to err on the side of caution and discard them.