Every material thing you own can weigh you down. I try to make sure I use everything I own vs owning things just for the pleasure of owning them.
I have pre kindle books that I wish I could convert to kindle.
I wrote amazon suggesting I give them my books for free, then they give me the digital copy at a discount (maybe 50%?) At some point I might buy the kindle versions and then sell the books to a used bookstore (at 25%).