My entire thesis so far could fit on a single 3.5″ floppy diskette.
That includes the final PDF, all the .tex files used to generate it, my bibliography, my style files, and a few PDFs of important articles that I make reference to.
I’m kind of tempted now to try to find a floppy diskette and an old computer and see if I can write my thesis onto it, just for the retro appeal.