Perks \tThe Metro Bag is the only Pump In Style portable option that includes a flexible plastic workspace and mesh bags, making your pumping experience even more convenient \tThe closed system ensures that breast milk does not enter tubing \t2-Phase pumping technology mimics your baby\u2019s natural feeding habits. The Stimulation phase encourages milk to start flowing and is followed by the Expression phase designed to pump milk quickly \tThe Expression phase uses the Maximum Comfort Vacuum setting to pump more milk in less time through the use of a vacuum pumping method \tThe pump is in a separate bag rather than being built into the Metro Bag, allowing you to either place the pump in the Metro Bag for on-the-go pumping or use the pump without the Metro Bag \tA removable cooler bag ensures your milk supply stays cold and allows you to pump and store milk on the go \tThe removable contoured ice pack keeps up to four Medela bottles cooler for longer periods of time \tBattery power or AC adaptor options make this pump ideal for home or on-the-go pumping needs \tA single knob allows you to easily adjust speed and vacuum settings \tMemory button allows you to save your favorite settings for future pumping sessions \tDouble electric pumping provides faster milk expression \tMedela makes all of their products and accessories coming in contact with breast milk BPA free This Pump is Perfect For\u2026 Moms on-the-go \u2014 This is a perfect option for moms who plan to be out and about and will need to pump. The breast pump is lightweight and is easily stored in a briefcase or carrying bag. What\u2019s Included \t(2) Connectors \t (2) Valves \t(2) Membranes \tTubing \t(2) 24mm PersonalFit breast shields \t(2) 27mm PersonalFit breast shields \t(4) Breast milk storage\u00a0containers \t9v AC adaptor \tBattery pack with soft carrying case \tBlack Microfiber backpack with built-in motor \tMetro Bag includes a plastic workspace to keep supplies clean while on-the-go, also includes storage for baby wipes, diapers, etc. \t(2) Mesh storage bags \tCooler bag with ice pack fits inside the tote \tUser instructions \tBreastfeeding informational guide What to Look Out For Moms should always make sure they have a suitable power option with them for on-the-go pumping.