Features: Compatible With All Medela Breast Pumps: Medelas Breasts Milk Collection And Storage Bottles Are Designed To Work With All Medela Breast Pumps. Pump, Store, And Feed With One Container. Dishwasher And Microwave Safe: Washing Our Breastmilk Collection And Storage Bottles Is Made Simple. The Durable Construction Makes These Breastmilk Bottles Dishwasher Safe. Easy To Read Volume Marks: Measuring The Amount Of Milk Youre Pumping Is Easy With Our Simple-To-Read And Colorful Ounce And Milliliter Markers. Screw-On Lids: These Six Breastmilk Bottles And Containers Are Capped With Screw-On Lids That Deliver Leak-Proof Storage, Travel, And Freezing. Loved By Moms, Recommended By Doctors: The World'S Leading Brand In Breastfeeding Research, Medela Has Worked With Researchers In Breast Milk For Over 60 Years, And Is The #1 Choice For Hospitals And Healthcare Professionals Around The World. Our Multi-Award Winning Breast Pumps And Accessories Are Used And Loved By Moms In Over 100 Countries.