It's this one. Had a run for 6 years using exclusively portapros. I'm using larger cans now, but I do kind of want one of those.

Koss just came out with portapros with (partially) detachable Usb C and jack cables, if you would like something that doesn't go inside your ears.

On the same note I really like GIFGAS. Bit of the same, just with train hopping across Europe. YouTube is apparently removing some of his videos though, but all should be on his Patreon.