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I've seen lots of great uses for this, including using a hair dryer and twisting the plastic to give it a spiral look, then heating it again and making into a bracelet. Plastic rope is pretty strong. Saw one post where they used several strands and towed a car with it. I have several ideas saved for making this type of project, but this seems like one of the easiest ones. Can find more ideas on YouTube.
Portable Device to Turn Plastic Bottles Into Rope
Reuse the whole thing: Glass bottles