Momcozy Breastmilk Storing Bags, Temp-Sensing Discoloration Milk Storing Bags fo TEMP-Sensing Discoloration - Keep abreast of breast milk temperature. Purple Milk is cold ( 40C/96.8F)Upgraded Strong Sealing - No leak, Breastmilk storing bags with double-sealed side seams. Material BPA-free, thickened milk bag, will not crack when heated or stored. Also can defrost or freeze milk quickly, saving time.More Convenient & Clean - Pouring milk import/export separation design, clear division of labor. Just open the sealing strip when pouring milk. When you need to drink milk, cut it along the cutting line and pour out the milk, which is more convenient to use.Save Space Design - Momcozy disposable milk storage bags can be laid flat or upright for easy storage. And it has a writing area, you can record dates and other important info.