Back in the old days I used to download a bunch of tracks to an iPod Classic for taking on holibobs since even if $HIRE_CAR didn't have a USB port and software that spoke Fruit it WOULD have a line-in socket. These days they’re positively festooned with USB ports so a wee memory stick will do the job just as well. Although some of them don’t grok m3u playlists, which is a pain in the wossname when you have to spend your first evening of jetlag renaming a couple of thousand files to play in the right order. Yes, I used a spreadsheet to generate the new numerical prefixes but the sloth of my laptop is such that the actual (re)Naming Of Parts took hours.