The can design of the brand “Bärenmarke” condensed milk didn’t change as long as I can think. For me it plays in the same league as the Campell soup cans of Andy Warhol. Minimalistic with clear colors - I really like it. I even like the bears on it.
I can remember when I was a kid and my older cousin explained to me that one has to make two holes in the can and not just one to make the milk flow. Believe it or not but it took me 20 more years to realize that this works with tetrapacks with orange juice, too.