This versatile adult feeding bottle is designed with YOU in mind — easy to hold, easy to use, and built for smooth, carefree drinking. It features an extra-large XXL nipple with a fast flow and a big vent hole, ensuring an effortless experience every time.Plus, it's a 3-in-1 wonder, compatible with all Rearz bottle nipples, allowing you to transform it into a sippy cup, "baby" bottle, or regular cup with ease. To safely remove the handle, simply twist it to unlock from the bottle, then pull it off. When you're ready to put it back on, line up the notches on the bottle and handle, then twist to lock it in place. Before first use disassemble and wash all parts with warm soapy water.