Personally I use an artists sketchbook with big pages, heavy paper and a thick cover. It's too heavy, but the contents are safe and the paper is of the right t

Personally I use an artists sketchbook with big pages, heavy paper and a thick cover. It's too heavy, but the contents are safe and the paper is of the right texture and unlined. I generally pick them up at University bookstores where they tend to be cheap (~$10).