The cooler bag set includes 5 extra 5oz/150ml BPA milk storage bottles. Ref. & freezer safe & 2 nano silver ice packs, which can keep milk cool up to 8 hours.
NOTE:Moms have to freeze the nano silver ice packs for 24 hours inside a freezer & the ice packs are good to go. Should mom need longer time for keeping your milk inside the cooler bag, extra ice packs can extend the cooling time.