I second these Maymom sets. Those rings are lifesavers. And I was dumb and didn’t read the instructions enough to realize what each of the different rings were for (different types of bottles), but once I realized which fit what my bottles no longer came loose.

I bought this set twice already. https://www.amazon.com/dp/B07LBPPGD7/ref=cm_sw_r_cp_api_glt_fabc_YVS264YRVNFPRVMX1RN3?_encoding=UTF8&psc=1