Creek Stewart, an outdoor survival school instructor, lists many uses for the feminine hygiene product, including water filtering (seen above) and wound dressing:
Tampons are sterile, come very well-packaged in their own waterproof sleeves, and are designed to be ultra-absorbent — making them the perfect first aid bandage. They can be opened and then taped or tied over a wound as an improvised dressing. And, as I’ve already mentioned, they can be used to plug a bullet hole until more sophisticated medical attention can be administered. Accounts of this use date back to World War I. Many items in modern society were first developed as a facet of military research — tampons may very well be one of these products.