The Medela Breastmilk Labeling & Storage all-in-one system helps you identify the freshest breastmilk and avoid waste. Compatible with Medela polypropylene breastmilk bottles and Medela Pump & Save? breastmilk bags. Clearly marked "in" and "out" arrows let you know which breastmilk bottle is "next in line". Special tray gives you dedicated space to protect breastmilk bottles and storage bags and keep them organized and upright. Perfect for refrigerator or freezer. Dishwasher safe. BPA-free. Includes 1 - tray, 2 - breastmilk labeling lids and 2 - 5 oz (150 mL) polypropylene breastmilk bottles.