10 oz / 270ml weighted straw sippy cup This next generation sippy cup uses straw + disk technology to leverage our patented buffer chamber and enjoy your favorite warm liquids! This sippy can even handle thicker liquids like milk. Featuring the original SILIFLEX-straw technology that is designed with a weighted ball so the straw always moves to the liquid regardless of the orientation of the cup. Just flip, tip, and sip to the last drop. • 9m+ • BPA & Phthalate free • Enjoy warm liquids with the use of the patented buffer chamber or cool with the direct connect straw.