Versatile Compatibility—Equipped with adapters and various sizes of flange inserts (17/19/21mm), this milk collector seamlessly integrates with not only the Momcozy V series breast pumps but also the majority of double tubing breast pumps, ensuring convenience and compatibility. Direct-to-Bag Collection—Featuring a 5oz/150ml milk bag capacity, our integrated milk collection cup & bag combo enables milk to flow directly into the bag, minimizing transfer and ensuring a convenient, hygienic, and efficient pumping experience. Convenient Milk Storage—With disposable screw-on milk bags designed to prevent leaks, your milk stays fresh and secure, providing a hassle-free solution for busy moms. Enhanced Comfort—Achieve optimal pumping comfort with Momcozy's DoubleFit Flange, providing a snug fit, ensuring efficient milk extraction, and allowing you to pump with ease. What's in the Set: Breast Shield*2, Outer Shell*2, Milk Storage Bags*30, Diaphragm*2, Valve*2, 17mm Flange Insert*2, 19mm Flange Insert*2, 21mm Flange Insert*2, Tubing*1, Tubing Adapter*2, Flange Cover*2. Breast Pump sold separately. Momcozy Wearable Milk Collection Cups with Storage Bags (5 oz), Direct-to-Bag Breast Milk Bag Combo, Breast Pump Parts for Momcozy V1 Pro/V2 Pro/V1/V2 Pump & Most Electric Breast Pumps, 2 Pack