I have this third-party lid and love it. Doesn’t lose suction like the official straw lid tends to do, and still having the handle is awesome.

https://www.amazon.com/dp/B07PVR8NR4/ref=cm_sw_r_cp_api_i_VUt7EbJ4E6AF2

The widen mouth lid for Hydro flask is a standard size. A 12oz wide mouth and 40oz take same lid. The Mass make good after market lids. So does Sendestar. And there's anything labeled wide mouth on the hydro flask website.