Leak-proof breast milk bags have integrated self-stick straps that attach easily to the pump. Bags feature easy, leak-proof zipper closures and no-spill stand-up bottoms. Pre-sterilized and double-walled bags are ideal for pumping, storing, and freezing breast milk. Compatible with all Medela® breast pumps (except Single Deluxe) for pumping directly into the bag. Labeling area for recording name, date, and time. BPA/DEHP Free.