A breast milk storage bag is a specially designed pouch used to store and preserve expressed breast milk for future use. These bags are typically made from food-grade materials and feature a secure closure system to prevent leaks and contamination. Breast milk storage bags offer a convenient and hygienic solution for storing breast milk, allowing lactating individuals to build a supply of milk for times when direct breastfeeding is not possible. They are often pre-sterilized and can be labeled with date and quantity information for organized storage.