Specifically designed for the Medela Pump In Style Advanced Starter Breast Pump, this bag is a convenient carrying case for moms who are going back to work or just going out to run errands. The black shoulder bag looks more like a purse than a pump bag, which makes carrying a pump discreet. It is durable thanks to its microfiber material. Its dimensions are 15.50 by 8.60 by 9.50 inches, making it big enough to carry things besides your breast pump.