Holds up to Five Large 8 oz Baby Bottles. Keeps your breastmilk fresh by maintaining the right temperature for hours using an air-tight temperature controlled environment. This keeps your breast milk free of bacteria and full of the key nutrients your baby needs for healthy development. Designed with a reinforced steel zipper so you can feel confident that your milk is protected from rising temperatures outside the cooler bag. Fits into Medela Pump-in-Style Carry Bag and has an adjustable strap for carrying it on your shoulder. Also Includes front pocket for easy storage.