These Breastmilk freeze flats are a must-have breast pump accessory guaranteed to reduce storage space needed during and after freezing breast milk bags. This freeze flat design is very simple, allowing for an economically friendly option with more versatility. The smaller holes on Freeze Them Flats act like "hinges" allowing you to adjust the width of the velcro in order to freeze small or large amounts in one flat, while the bigger holes allow you to easily secure the milk in the flats. Freeze Them Flats also come with more velcro to allow you to easily secure the flats and the option to freeze larger amounts of milk. Fits with most breastmilk bags such as Lansinoh, Parents Choice, Medela, Spectra, Up & Up, Spectra, Dr. Browns, and more.