I’ve tried many things through my life. With gps satellite maps on my phone, I rarely mark anything in the woods now. I do carry reflective tape pieces cut 1/4 wide x 2in long for thick areas. I just wrap it around a twig, branch, or leaf, hanging down so I can see it from 360. They take up hardly zero room and stay in my hip pouch on my backpack for easy access. No one will notice them in daylight. The roll of tape was given to me. It’s a coast guard reflective tape.
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This stuff is extremely bright so you only need small pieces. If you wrap it back on itself it will hold very well. Have to cut off. I use to wrap a small piece around the ends of clothes pins but they were too bulky. Then I wrapped them around tacks but still bulky and had to have them in a container. Just made sense to keep little strips and wrap them back on themselves around sticks.
After seeing those ropes posted above, it made me think of this stuff. I use the 1.8mm reflective rope on my tarp guylines for my hammock. They shine awesome. If the rope trial markers is what you want to use, id look into these items.
At DutchWare we sell a variety of high quality reflective rope and cord for all your outdoor camping supply applications. Shop at our online store!
dutchwaregear.com