Many moms want to have extra breast milk bottles on hand to meet their growing and changing breast milk supply. Medela Breast Milk Collection and Storage Bottles Set, 5oz, Clear and Yellow, 87095, 6 Pack simplifies mom's busy life by allowing her to pump, store, and feed into the same container. They are compatible with Calma, making it easy to expand her breast milk bottle collection and streamline her shopping experience. Medela's Breast Milk Collection & Storage Bottle Set is a perfect complement to mom's breastfeeding experience.