5 oz. BPA free. Clear view bottle with latex nipple. Reduces colic with vented nipple design for less air. No. 1 selling reusable baby bottle in the USA (national brand sales in units). First Essentials is a complete line of baby bottles, pacifiers and accessories that cover all the basics - simple solutions for mom and baby. Slow flow nipple specially sized for newborns. Ribs and vent help prevent nipple collapse. Leak proof hood. Fits most breast pumps. Assembled in USA.