If you carry a notebook, journal, day planner, day runner, etc. and it has enough room, like the spiral binding on this one, you can try adding some paracord.
The size of the book will determine how much cord you use. I ended up using close to 10 feet of 550 paracord on this 6 inch tall day planner.
It's tied similarly to a paracord bracelet, but you run the cord around the binding and back through the outer binding rings before you start knotting and again through the center of the spiral section at the end. This start used a little over 3 feet of cord without counting the knotted section.
I also ran the knot strands through the outer binding to keep it close/flat and secured against the spine, but you can skip doing that if you want the knotted paracord to make more of a hand grip/handle for the book.