I have most, not all, of my manuals in PDF format. I find them on the web. I store them on Google drive and they are synchronized for off line viewing on my PCs, phone and tablet. I too keep paper copies on the boat, but I have no where 100 lbs. I find that I only go to the paper copies occasionally. I often find paper manuals easier to browse, but electronic ones easier to find. I have a big pile of paper manuals, all of different shapes and sizes that I can't manage to store in an orderly manner.