Do you ski? Do you ramble over mountain tops? Go for long walkies in the wilderness?
Be smart. Take brightly coloured, reflective, glo-in-the-dark, large inflatable balloons with you. If you get into trouble, simply inflate and tie to yourself, so air/sea rescue can see you from a distance. Won't weigh anything extra to your kit. Could save your life. Should be made/sold in standard SOS package/style so easily recognisable.
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