The Twist 'n Pop Straw Cup is the newest edition to the popular BornFree collection of training cups. Featuring a soft silicone straw and air vent for comfortable drinking, the spill proof cup incorporates a twist straw mechanism to keep the straw clean. 14oz. body is fully interchangeable with the BornFree feeding system. Better still, it is BPA-free so you can be sure your little one stays healthy.