(60) 1-Gallon Genuine Mylar Bags + (60) 300cc Oxygen Absorbers for Long Term Food Storage by ShieldPro 3.5 Mil Thick Bags with excellent barrier properties to Oxygen and Moisture. Use 1-2 300cc oxygen absorbers per bag. Seal the bag a full 2" to prevent air infiltration. These are strong but economical bags, particularly when storing for a shorter period of time (5-7 years). Heat seal using a standard clothing iron, impulse sealer, or clamshell sealer. A Food Saver may seal these bags, but will not vacuum them. FDA-Approved, BPA Free Mylar Bags.