The Medela - Swing Breastpump w/Pump and Save Breastmilk Bags Bundle is Medela's smallest, lightest single electric pump. Experience 2-Phase Expression technology in a portable, single electric pump. Compact enough to easily fit in your purse, this Medela Swing Breastpump w/Pump and Save Breastmilk Bags Bundle is both safe and comfortable to use, whether you're home, at work, or traveling. Save time by pumping or pouring into a bag with the new easy-connect adapter for fast, easy breastmilk storage. The oxygen barrier preserves and protects breastmilk nutrients.