Thanks to Packit's patented freezable gel-liner you can keep your baby's milk cool for up to 6 hours! The Baby Bottle Cooler allows you to feed your baby bottles without worrying about refrigerating. Simply store the cooler in your freezer for a 12 hour period, pack with the items you want to keep cool and enjoy! PVC free, PBA free, lead free, non toxic, earth safe and reusable. Handwash with mid soap and warm water. Allow to air dry completely with flap open before storing in the freezer to prevent frosting on the cooler.