The Evenflo Feeding Stackable Silicone Breastmilk Storage Tray 2pk allows you to store up to 4 ounces of breastmilk (2 oz. per tray) in your freezer or cooler. One freezer tray can fill eight adorable heart-debossed drops of love. Each perfectly-portioned drop holds one quarter-ounce of milk which helps reduce the risk of waste by allowing you to employ only the amount needed for a feeding.