Medela?s bulk package of breast milk storage containers includes 12 2.7-ounce (or 80 mL)-sized bottles that are ideal for collecting, storing, freezing, and feeding small amounts of breast milk to your baby. Our signature bottle design features magnified, easily readable millimeter and ounce measurement markers, so you always know how much breast milk you?ve pumped and how much your baby has consumed during each feeding. A curved bottom helps to ensure no breast milk is lost while screw-on lids provide leakproof security, making these breast milk storage containers easily portable, travel-friendly, and ultra-protected while stored in your refrigerator, freezer, or cooler bag. What?s Included: (12) 2.7-Oz. breast milk bottles and lids Additionally, our bottles? unique design allows you to store your breast milk for longer-term periods while minimizing the loss of any of its natural, beneficial properties for efficient, safe breast milk freezer storage or refrigerator storage. Remember, proper breast milk storage guidelines apply to all bottles, containers, bags, and other methods of storage. As always, all Medela breast pump parts, accessories, and bottles that come in contact with breast milk are - and have always been - made without BPA. Though these breast milk storage containers are not recommended for use with our Single Deluxe breast pump, they are compatible with all other Medela breast pumps for seamless convenience through the length of your breastfeeding journey. *QuintilesIMS ProVoice Survey; November 2016 - October 2017