Ello Stratus is perfectly portable and recess ready. Its locking flip lid with one-handed push button makes it easier than ever to keep kids hydrated on-the-go. The 16-ounce size holds just the right amount of water, and ultra-durable Tritan plastic paired with a silicone band reduces chances of breaks. Sip comfortably with Skyler's silicone soft straw lid that threads off for ice and cleaning. Pop, sip, close and go! Certified BPA, Phthalates, PVC and lead free. All parts are dishwasher safe.