I've considered using mylar paper-tape as a long term digital storage medium. I thought about either standard sized paper tape, or six foot wide reels of mylar

I've considered using mylar paper-tape as a long term digital storage medium. I thought about either standard sized paper tape, or six foot wide reels of mylar (in any length) which can be punched at a pretty high bit density, and read back optically. With instructions printed on the outside (and on the first dozen layers), much like the voyager record, explaining how to play it back, and construct a playback device, and how the encoding works.