Outpost Survival Tip of the Day: Tampons are a multiuse survival item. Aside from the obvious, a tampon can be used in the following ways and more.
Bandage, Improvised Whick, Fire Tinder, Fletch, Cordage, Water Straw, Improvise Water Filter, Bellows, Fishing Bobber, Waterproof Container and much more.

Here is a great video describing some of the uses.