I did the same. I had barely any possessions; my laptop, a toothbrush, clothes, a desk lamp, pots/pans/knives. But I made up for that with boxes upon boxes of almost every book I've ever owned. I eventually catalogued the lot, found digital copies of all of them, and donated everything to a charity shop. Now, instead of 5 or 6 boxes full to the brim that need a rental van every time I move, I have a NAS that stores maybe 10k+ books; more than I could collect in a lifetime. I miss the feeling of a page turn, but I can just power on my tablet and have every book I could ever want to read at my fingertips now.