Question about Medela Cooler bag with 4 milk bottles and 1 cooling element

The shelf life of the cool packs in the cool bag depends on the quality of the cooling and the handling. There is no specific expiry date for the cool packs as they can generally be used for as long as they retain their cooling capacity. The cool packs should be checked regularly to ensure that they continue to cool effectively. If the cooling capacity decreases, they should be replaced.