Lansinoh® Breast Milk Storage Bag 6 oz. (1083478_CS) 6/CSThese breast milk freezer bags hold 6 ounces of milk each. The bags use BPA and BPS free materials. Pump breast milk directly into the Lansinoh breast milk storage bags with a Lansinoh pump. A double zipper closure and double seal, reinforced side seams prevent leaks An adapter is available separately for use with other pumps. Measurements are clearly marked in both Imperial and metric systems. The bags have space at the top for marking information,