Freeze expressed breast milk in one-ounce servings eliminating waste associated with nurser bags. Now moms, dads, family members and caregivers can make bottles to order. If baby needs a 3 oz. bottle, go to the freezer, grab three Milk Sticks, drop them into the bottle, thaw and serve! Making bottles has never been so easy. The Milk Trays are very flexible so frozen milk comes out easily. How do moms use the Milk Trays? Pump into the bottles the pump comes with, pour the milk into each of the cavities of the tray. Place the lid on the tray and then in the freezer. In about 3 hours the milk will be frozen. Transfer the frozen milk into a FREEZER SAFE ZIP LOCK BAG, date the bag and keep in the freezer long term. Wash and reuse the trays! Milk Trays are easier, safer and more economical. Invented by moms for moms. Made in the USA