Four (4) clearly marked Collection Bottles to measure collected milk volume, up to 4 0z/120 ml Pump and store in the refrigerator for upcoming meals or freeze in the bottle for future use Just add Dr. Brown's bottle parts and teat (sold separately) for feedings right from the same bottle Included are four (4) Storage Travel that tightly seal the bottle, making storage and transport simple Dishwasher (top rack) and sterilizer safe for easy cleaning. BPA-free, 0m+ From breast to bottle to storage, pumping breastmilk is simplified with Dr. Brown's Breastmilk Collection Bottles. Pump and store with Dr. Brown's Breastmilk Collection bottles, right from many different types of breast pumps. Each Breastmilk Collection bottle is clearly marked to measure collected milk volume, holding up to 4 oz/120 ml of breastmilk. Pump and store in the refrigerator for upcoming meals or freeze in the bottle for future use. When it's time to feed baby, just add in Dr. Brown's bottle parts and teat (sold separately). Included Storage Travel caps tightly seal the bottle, making storing and transporting easy. Clean-up is simple with these dishwasher (top rack) and sterilizer safe Breastmilk Collection Bottles. Included in set are four (4) Breastmilk Collection Bottle Vessels and four (4) Storage Travel Caps. BPA free. 0m+.