Momcozy Breast Milk Storage Bag 177 ml / 180 mL Silicone Clear - PackEasily monitor milk temperature with Momcozy's smart color changing system: Purple indicates cold (below normal body temperature); blue signals optimal feeding temperature (96. 8 to 104 F) and white warns the milk is too warm (above 104 F). Double sealed side seams and double zipper closure make these bags secure and airtight. Maintain the purity of your milk with an in out separation system: Simply open the seal to pour milk in and cut along the