The Medela Breast Milk Collection/Storage Bottles are a set of leak-proof, self-standing bottles designed for collecting and storing breast milk. This pack includes 5 clear bottles made in the United States by the trusted brand Medela. The bottles are convenient for storing and organizing breast milk, making it easier for nursing mothers to maintain a supply for their baby. The included steam bag adds an extra level of convenience for sanitizing and sterilizing the bottles.