Medela polypropylene breastmilk bottles are made without BPA, designed to retain breast milk's beneficial properties. Compatible with all Medela breast pumps, so you can pump, store and feed with one container. Great for long term storage. Dishwasher safe. Measure the exact amount of milk you're pumping with the colorful ounce and millimeter markers. Screw on lids for leak proof storage, travel and freezing. Travel cap keeps nipple clean.