I smiled at your 15 boxes for moving, Rain. Yes, you underestimated.
I've done two major moves in the last four years: for the first I pared my lifetime accumulated reference & reading library from *cough* EIGHT *cough*
floor-to-ceiling bookcases in my library/studio room down to five. (Granted, I had videos and music there as well, but still...) The local high school art teachers got a nice boost for references, and I released most of my theology (and heresy!) texts to people who would benefit from them. I still had forty (40) 'medium-sized' boxes of books, dvds and cds.
Can you say, 'biceps'?
Recent move pared down further: I arrived here with only thirty 'medium-sized' boxes. I'm down to (six) 6' tall bookshelves without the 22" extensions that took them to the ceiling in the old place. Gak!!! I'm running out of books!!!
And I always cough up money for book boxes at U-Haul so they're new, sturdy, and stack well. A co-worker gave me a tote bag long ago with a quote by Desiderius Erasmus: "When I have a little money, I buy books. And if any is left, I buy food and clothing." I am amazed at how many people live with no visible signs* of literacy. * Unless you count TV Guide, I guess.