This is one of those products that you hope you'll never have to use but is an ideal addition to any survival kit. The UST Brands StarFlash Floating Signal Mirror is virtually unbreakable, and a lanyard hole at the corner allows for easy attachment to your gear so you won't lose it. The lightweight mirror will float in water and is powerful enough to reflect light even in overcast conditions. This thing may be tiny, but it's packed with features to help get you out of a bind should you ever need it.