Introducing our Design Your Own Kids Tumbler 12 oz Sippy duo! This stainless steel tumbler is perfect for parents who want to customize their child's cup. The tumbler comes with a sippy lid and a screw on sliding lid for the next step of drinking, making it perfect for the little ones, and as they grow, the cup can grow with them thanks to its sippy duo feature. Let your child's creativity run wild as they design their very own tumbler! This tumbler is perfect for on-the-go and can keep drinks cold for hours.