Every time someone mentions an interesting book, I make a note of it. Then a couple times a month, I go back through my notes, pop open a website that shall not be named, snag em all, throw them into calibre-web and sync them down to my ereader. I can get hours of enjoyment from a 1-2MB file, and I love that. Same for older cartridge-format game roms, a N64 rom is generally under 50MB and can keep me busy for days, an NES or GB ROM is usually smaller file size than a book, and some great old DOS games clock in at a handful of MB.
What other great bang-for-the-storage-buck stuff is out there that you enjoy?
Alright then, how about this?
For just 32kB (plus the size of a Game Boy emulator), you can play the amazing Tetris Rosy Retrospection. It’s a romhack of the Game Boy Tetris that adds modern Tetris controls, handling, and features to make it feel much better to play without increasing the file size. I’m aware of the color version of this hack, but it doubles the file size to 64kB, so I’m only considering the regular Tetris Rosy Retrospection this time. Byte-for-byte, I can’t find a better game to sink dozens of hours into.