Here is perhaps one of my best and still working designs to date. Despite how simple it is I've been using it for all the books and stories I've been reading both in high school and at home. The design resembles a spaceship interior, or star wars spaceship to be exact, and takes a rectangular form to fit and cover 1-10 pages at a time. The flat shape at the end ensures that nothing breaks while you transport it, and has no design to ensure that nothing really interferes with your reading.
Hopefully you like it!
UPDATE My school did a computer update and I can't upload anything 3D for some reason but I will keep trying for now.