I would like to make an adult sippy cup with removable lid with a built in valve at the spout so liquid does not come out unless suction is applied. The seal from the bottom of this to the connecting part needs to be leakproof. It needs to be a clear plastic material. The spout should be wider and flatter for easier sipping, and not cylindrical like a straw. It should feature a built-in valve to prevent spills when not in use. The spout should be slightly angled to make drinking easier without needing to tilt the cup too far. Lid should screw on securely with a leakproof seal.

I would like the bottom 3/4 of it to be thermochromic so it changes colour when hot liquid is in the cup. The other 1/4 I would like it to be clear plastic so users can see how much liquid is in there. I would like it to hold 500mls of liquid and I would like it to have measurements on the side going up in increments of 100mls. I would like the cup to have two handles on each side with groves where the fingers should be for easy hold. I need it to attatch tightly to the lid so it does not leak. Two ergonomic handles that provide extra grip and stability for the user, extending vertically on each side of the cup.