Replacement Glass Milk Bottle Lids 48 mm Caps for Libbey and Stan-Pac (6 Pack White) Reusable 48 mm snap on lids. Be sure to measure the opening of your bottle to make sure these will fit properly. Made in the USA Fits MOST Stan-Pac and Libbey milk bottles BPA free plastic Be sure to measure the opening of your bottle to ensure these will fit properly.