Oh, they’re so ubiquitous nowadays, I doubt only product engineers who work on making a slightly better one would notice. The pop-top.
There’s really a lot going on here for two pieces of aluminum riveted together. Think about the failure per million rates… Pretty low. Old fashioned pull tabs that people would pull off and discard were sharp and injured thousands of people per year.
The lid was probably pretty simple: raw stamped discs would be stamped into the shape with the dimples and ring depression, then stamped again to score the pour opening and lettering.
The ring probably had to go through several more punching and finishing steps before getting a rivet, but it seems like an amazing bit of mechanical as well as product design too: Strong yet bendable without breaking off, and high enough above the lid to get the right lever function to pop open the can seal. It Must work at least once… lol
The can seal has to be sanitary, air tight, and yet be torn open with a few ounces of pressure (at exactly the right place).
And they stamp out billions of them per year.