This sippy + training straw cup is designed to grow with your child from a sippy, to a straw, to an open cup, and it is the perfect transition cup from baby to toddler. The top lid reverses as a weighted suction base to add stability for straw-training and reduces the chance of spills. As your child grows (or when using the sippy spout), you can flip the suction lid to a flat base. It can also be used to store our straw for on-the-go, keeping it clean and secure in your diaper bag. The training straw has a middle stopper to prevent your child from removing it, making it the best sippy and straw cup for your little one.