The Medela city style breast pump bag is ideal for active mothers on the go: it has plenty of space for a Medela pump and accessories as well as a cool bag to keep your milk cold the Medela CityStyle breast milk carrying bag comes with a removable cool bag, four breast milk storage bottles and a specially shaped cooling element that will keep your milk cool for longer a safe and easy way to transport breast milk and keep it cool an elegant and stylish accessory to use whilst breastfeeding and afterwards plenty of space for your pump, breast milk and accessories.