We designed the OXO Tot Transitions Straw Cup, Opalto help minimize the big mess that comes with big kid sips. The almond-shaped, spill-proof straw conforms to your tots mouth, easing the transition from bottle, breastfeeding or sippy cup. The straw valve opens as soon as tots lips touch it for easy drinking, and the hinged cap closes to create a leakproof seal. The cap and straw are removable for easy, thorough cleaning. BPA free. Dishwasher safe.