The oxygen absorption packet is filled with iron powder - a naturally occurring mineral that absorbs oxygen. The iron powder in the packet keeps our sweet potato jerky fresh by removing oxygen from the bag and preventing oxidation of the sweet potatoes. Oxidation causes sweet potatoes to change color and lose some of their good flavors - just like potatoes that begin turning brown when you cut them - as well as the degradation of nutrients over time. Please remove and dispose of the oxygen absorption packet when you open the bag. While iron is a naturally-occurring mineral, it should NOT be fed to your dog. Just like most vitamins and minerals, iron can be dangerous at a high dose, and the oxygen absorption packet is not intended to be consumed.