300 ml. 100% Leak-Proof: Spill-proof & beak-proof guaranteed. Easy grip shape. Hourglass shape prevents tipping. Bite-resistant spout. Encourages healthy oral development. Unique flow-control valve makes it easy for child to drink. Promotes safe, independent drinking. www.nuk-usa.com. Also Try: Tri-suction bowls; Rest easy spoons. BPA free. Made in USA.