Made from 100% new plastic pellets, safe from carcinogens, helping to organize breastmilk stocking more conveniently. The size is suitable for stacking breast milk storage bags and filling breast milk storage bags. Thick bag of meat can be frozen at -20 degrees Celsius. There are 2 types of zip bags, zip lock and slider, easy to open and close, convenient to use and prevent leakage. The bottom of the bag is designed for standing. There is a wide text memo tab, easy to write. Can be used with all types of ballpoint pens. Can store a variety of things for the convenience of the mother. Can contain 8-12 breast milk storage bags. Food safe Special features: There is a QR Code to help manage breast milk stock easily.