Popyum Pink Formula Making Baby Bottle Set 4-pack With White Drying Rack BundleTwo pink 5 oz (150 ml) bottles with #1 slow flow anti colic nipples Two pink 9 oz (260 ml) bottles with #2 medium flow nipples Bottles store formula and water separately for on demand mixing One handed operation: press buttons, shake, and feed Breast milk stays isolated until released into the nipple area Anti colic venting prevents milk contact with leak points until activated Glacier white space saving drying rack made from recycled bottles Compact