We recommend freezing milk bags upright to maximize capacity! Freezing milk flat or using bags that do not have a zip top will decrease the amount of milk you are able to fit in the cooler.
1. Place frozen breast milk into the Freeze & Ship™ or Freeze & Tote™ cooler.
2. Once milk is packed, place lid on top, ensuring that it sits flush. Close the outer box.
3. Use circular seals to seal the cooler.
Milk Stork Freeze coolers do not have an activation button. Our coolers work with high performance vacuum insulated panels that will maintain the frozen temperature for up to 96 hours.
The cooler must be packed to full capacity for the milk to stay frozen. If you did not have a full stash, you could fill the difference with frozen Ziplocs of water. It just needs to be packed to capacity in order for the milk to stay frozen.