The Closer to Nature milk storage bags are pre-sterilized and convenient for storing breast milk. They have a secure double-fastened seal, stand upright with a gusseted base to prevent spills, and offer an easy labeling panel. This product is part of the Closer to Nature breastfeeding range, which includes a system of interchangeable breast pumps, storage containers, and feeding equipment, simplifying the process of feeding and caring for a newborn.