All you need are your used straws (preferably cleaned) and your scissors.
Starting from the tip or base, cut the straw continuously in a diagonal manner until you reach the other end and voila a free spiral cable binder that works the same with those store bought spiral binders.
You need to cut the jagged edges to make clean and safe.
Flatten the piece and use a cutter or your scissor and run through it again
Let's re-purpose stuff!