All I need now to go for a walk are my sandshoes, my Apple Watch and my AirPods, because I can listen to my music directly from my Apple Watch. To save it on there, make sure you have the playlist set up on your phone that you want, put your watch on its charger, then go to the Watch App on your phone, go to the Music section and use the plus button to add the playlist you want. The watch will start synching- give it some time as music files are large. Once the music is on your watch, synch your wireless headphones, open the music app on your watch and press play.
Of course, if I need a drink I can stop at a shop and pay with Apple Pay. And if you set up a smart lock on your front door then you don’t need to carry keys either.