It's humbling to know that the RAM of computers like ZX Spectrum and Commodore 64 would fit in a single IP packet. It took minutes to load that "paket" from cassette tape.
The concept is widely covered in the amazing book Silence on the Wire[1] by Michal Zalewski. I wish he or someone else would write modern equivalent (or at least a new, updated edition) of the book.
He stores data in ICMP ping packets, but also Tetris board states, among others. If you are not familiar with Tom7, let this be an introduction to a heavyweight whimsical internet nerd