Maintain your breastmilk’s complex life-enhancing properties with Medela’s BPA-Free Breastmilk bottles.Designed to store and protect breastmilk within an optimal temperature range of -20 and +37°C, the Medela Breastmilk bottles simplify the breastfeeding experience by integrating seamlessly with all Medela breastpumps and the Calma Feeding System and reducing preparation time.Pump, store, and feed from the same bottle to maximize expressed breastmilk available to baby.Compatible with all Medela breastpumps and the Calma Feeding system.Accurate volumetric graduation lines to easily read, track, and document volume of breastmilk consumed at each feeding.Dishwasher, freezer and microwave safe when using steam cleaning.Breastmilk should never be microwaved.Assembled product dimensions: L 2.36 inches x W 2.36 inches x H 5.31 inches x W 0.09 pounds.