Safe plastic designed for long-term storage and retain breastmilk's beneficial properties. Set includes: (3) ounce/250 milliliter breastmilk bottles, (3) solid lids, (3) medium-flow silicone nipples, (3) wide base collars and travel caps. Compatible with all Medela breast pumps to pump, store and feed with one container. ; Safe design allows moms to store their breast milk long-term without losing any of its natural beneficial properties. ; Dishwasher safe - cleaning couldn't be easier with our dishwasher safe bottles. ; Easy to read volume marks - measuring the exact amount of the milk you're pumping is easy with our colorful ounce and millimeter markers. ; Travel cap keeps nipple clean. ; Made without BPA. ;.