Allows individuals to learn or re-learn straw drinking with less effort – just squeeze the desired height and then release. The valve allows fluid to stay in the straw without flowing back into the cup. Use the Lip Blok to stop straw biting or to prevent the straw from going too far into the mouth. Includes one flexible Cip-Kup Bottle, 8 inches of special polytube, one Lip Blok (3/4"), one Select-Flow Valve, and 12 clear straws, all packaged in a large reusable seal top bag.