An emergency use item that should be standard issue in hot countries, with it you can signal directly to aircraft that may be searching for you.
AMK says: Visible over 10 miles! Target planes, helicopters, and distant search and rescue teams with the Rescue Flash Signal Mirror. The 3M reflective aiming aid enables you to signal targets from miles away, and the lightweight Lexan construction will not break if dropped.
Ideal uses: Ski / Snowboard, Hiking / Backpacking, Alpine / Rock Climbing, Mountain / Road Biking, Hunting / Fishing, Off Roading, Paddlesports, Marine, Emergency Prep