Pumping and storing breast milk takes effort. This labor of love is now made easier with Milk Trays breast milk freezing system. At first glance, Milk Trays look similar to typical ice cube trays. BUT – take a closer look and you will see that they are much, much more. Milk Trays are specifically designed for expressed milk with a total of 16 semi-cylinder cavities holding 1 oz. each, freezing your milk in 1-ounce “Milk Sticks” that fit through ALL bottle openings. This allows you to thaw just the right amount of milk for each feeding. Milk Trays have fitted lids that protect your milk while it freezes and allow for space-saving stacking in the freezer. And the trays are flexible enough to allow the Milk Sticks to be removed easily. Made from PET plastic, a food-safe plastic that contains no bisphenol-A (BPA), phthalates, or dyes.