Medela Breast Milk Cooler Set w/ Contoured Ice Pack & Four 5-oz. BottlesYour Breast Milk, Kept Cool: This cooler set lets you easily transport up to four 5 oz bottles, keeping milk at a safe temperature for up to eight hours until you can get to a refrigerator Fits Right In: Designed to fit seamlessly inside the Sonata, Freestyle, and Pump In Style bags for a straightforward way to carry all your breastfeeding supplies Compatible with Medela 5 oz Bottles: Both the cooler bag and contoured ice pack are compatible with