In my case, I do product testing for an earbud manufacturer, in my spare time, so they keep sending me free sets.

I just have one set for the computer, a couple sets that are paired either my phone and another device, one set just for the phone, one for my Switch, one for my Mac, etc...

Super handy until you misread the markings on them and grab the wrong ones.

EDIT: Cripes. I just realized how many sets of earbuds I own. Yikes!