Mylar bags used in food storage have revolutionized the way that food is stored long-term. My first time using the mylar bags… i tried to post a pic but it would not let me. Oxygen and sunlight can cause discolouration, loss of taste, compromise product freshness and allow insects to breed. These are the cans of rolled Quaker oats that you can get from the local china-mart. For more detailed info, see this post which goes in-depth on oxygen absorbers. They won’t absorb nitrogen in the air. Only package as much as you actually eat and rotate through them regularly!