All paper is hydroscopic it will pull some water from the air and lock it away and not release it. It is a property of cellulose.

I still use coco coir products environmentally friendly and cheap. I didn't realize that the paper was so much! (about 100 changes (?) for 53$ ? I'd average $5.30 a week! I get about 125 (220L) changes for 7$ average 31¢ a week)

Sorry my dad is very Scottish...