Check out this obsessive collection of plastic bread bag closures

I've never paid attention to those little plastic squares used to keep bread bags closed. Then I came across this site that has a taxonomy for bread bag closures. There are so many different kinds!

Also: in 2016 two bread bag closure manufacturers went to court over the design of their closures. This article reports that the judge ruled that  "functional design elements cannot be protected by the trademark laws."

[Via Sensible Endowment]