What a “cool” idea! The Breastmilk Cooler Set is great as an extra set for bringing to work or school to store pumped breastmilk or for leaving at daycare with your baby. The contoured cooling element is designed specifically for your Medela breastmilk bottles. Includes: 1 – cooler bag, 1 – contoured ice pack, 4 – 5 oz/150 mL bottles with lids