Anatomical design will fit most breast shapes 150ml/5oz. capacity allows you to pump and store, or pump and feed The Medela Family app (not included) lets you track your pumping session and access your Virtual Milk Storage Collection cups have two flange sizes: 21mm and 24mm Product comes with two collection cups, tubing, two membranes, two 24mm hands-free cup breast shields, and two 21mm hands-free cup breast shields