PeakFresh produce bags remove ethylene gas to prolong the life and freshness of produce, more than doubling the life expectancy of refrigerated fruits and vegetables. Most fruit and vegetables release ethylene gas after harvest. Exposure to this gas accelerates aging in fruit and vegetables (the expression one bad apple spoils the barrel comes from this process). Unlike ordinary plastic bags, PeakFresh produce bags have a natural mineral embedded in them to absorb ethylene, minimize moisture formation, and assist in maintaining Vitamin C levels. To use the produce bag, pre-cool warm fruit and vegetables in refrigerator before storing in bag. Use a separate bag for each type of produce. Produce to be stored should be fresh, dry, and undamaged. For produce being stored at room temperature, no pre-refrigeration is needed; simply put the produce straight into the bag. Expel air from the bag and close using the enclosed ties. Bags should be washed and dried thoroughly before re-use and can be re-used for up to two months. Keep bags away from fire and children. Set of 4 packages - 40 bags total.