I live in a house with lots of books (good) and dogs (not so good).
Animals create a lot of dust and this clogs the outer page surfaces of books, even when stored in a bookcase.
Today’s invention is a better dust cover. It comes with an extra flap on one side (a) which can be folded into the other side of the cover (c), leaving a roof over the page edges (b).
A similar flap could be made to wrap the front edge of the pages (opposite the spine).
Although marginally more expensive, this dust cover could be filled with even more breathy praise for the work inside than normal…(or just ads for the next book).