Better book marks? I can just hear people saying "but that's too trivial to even spend time thinking about !" But I don't think so. Marking your place where you temporarily stopped reading is very useful, and so much of it is not done well at all. A lot of people fold down the corner of a page. This is inefficient in that it damages the book, if only slightly. And where was your stopping point ? At the top of the page ? With my method, it's easy to leave off reading at the start of any paragraph.
Sometimes a book has a ribbon, which is just about useless. Ditto the normal book marks. I use a rectangular few sheets of paper, maybe about 3" x 4.5", though I do use different sizes for use in books of different size. At the midpoint of the longer of the two dimensions I use a pen to draw a line with an arrow head. That's about it. The arrow points to my"resume reading" place. A longer envelope works well when it's folded in half, giving you 4 thicknesses of paper. With that, the different thicknesses stay together easily.
Sometimes a book has a ribbon, which is just about useless. Ditto the normal book marks. I use a rectangular few sheets of paper, maybe about 3" x 4.5", though I do use different sizes for use in books of different size. At the midpoint of the longer of the two dimensions I use a pen to draw a line with an arrow head. That's about it. The arrow points to my"resume reading" place. A longer envelope works well when it's folded in half, giving you 4 thicknesses of paper. With that, the different thicknesses stay together easily.