I'm trying to get a handle of how or why my lecture notebooks are so bloated. I've been bringing in all images and manuscripts that I use for my class as pdf files for easy printing on the web version and I know that this can add some bulk. However, after saving a copy of my lecture notebook and removing all imported pdfs and removing the discard attachments in the index and saving once more yields a file of exactly the same size as before I removed anything. This doesn't make sense to me. Any ideas?