The Zoo Straw Cup helps ease this transition by giving little ones a "big-kid cup" with the protection of a flip-top lid. Dishwasher-safe transition sippy cup. Straw flips down to seal closed and stay clean Handy grab-strap attaches to anything so you can take the straw sippy cup on the go. Holds 13 oz.BPA-free, Phthalate-free, and PVC-free