when I first register for this I do not realize how great it be ! this be a must have if you be breast feeding . it be so much cooler than I even know it be . when u pump into the storage bag and put it in the organizer it have a spring that squish the bag of milk flat and literally make it paper thin ! you can store a ton of milk in it and it be like a filing system because u can look through the top that u have write on . such a awesome gift . one of my favorite !