Each bag of frozen breast milk you provide to Milkify becomes its own pouch of powder. When we receive your milk, the starting volume of frozen milk in each lactation bag is recorded. The instructions on the back of each pouch of powder you receive will indicate how much water to add back to the breast milk powder. This rehydrates the milk to its original consistency. For example, if you send in lactation bags with 5 oz. of frozen milk in each - the pouches you receive back would have the powder needed to make up one 5 oz. bottle per pouch. You can see more about this here.