When our second child was born, we no longer had the luxury of a nearly empty freezer like we did with our first child. My wife and I were looking for solutions to freezing and efficiently storing breastmilk in bulk. We tried multiple options, like a cookie sheet or another product that uses cumbersome velcro straps, but the results were about the same as just laying them in the freezer – lumpy, misshaped bags that slid all over the place.We developed these trays to be simple to use, compact, easy to store, and produce perfectly flat breast milk storage bags.