Really like the idea of having a mic attached to your backpack to record and listen back to things you sometimes just say randomly

I already tried to get it transcribed in Google Cloud so that I could get a summary email with a map, stats and the recorded notes in text form, but it didn't work. That was around two years ago, so maybe nowadays it could work. Also the notes are spoken in German which was bad back then and have some degree of noise in it (gravel, wind).

Edit: I just tested it with the recorder app on my Pixel 3 (played back via headphones pressed against the phone's mic) and it was able to transcribe it with almost no errors, so there is hope.