Teach children how to use glasses? In the first few years, the overflow-proof straw cup was very suitable for this purpose. They are provided in a pack of four, which are durable and can be used once. These straw cups have an easy-to-clean design, can be snapped, and there is no valve on the lid, so you don’t have to worry about dust and dirt getting stuck in those places. In addition, they are dishwasher safe and made of BPA-free materials, so they are safe to use. They can be used with children over 18 months old.