I'm sure I've posted this before, but my whizbang survival item is a large cotton bandanna, orange or yellow, dry HOT ironed and folded to pocket size with the iron, slipped into a sterile Gerber Breast Milk bag and sealed flat. The bag edges are protected with Gorilla tape and about ~40" of flat folded Gorilla tape is attached to the bag. Its a bandage, torniquet, chest wound seal, signal flag, dust mask, repair tape and handkerchief, all in one. I carry at least one on my person and more in my EDC pack. Not original but super useful and it never hurts to repeat old but good advice.