Flint

It's hard to find as many survival features in an item as one would in the Flint. The Flint packs enough survival and defensive components to get you through the night or away from danger. In a tool the size of a pencil, the Flint has a built-in fire starter, steel wool tinder compartment, carbide-tipped glass breaker, and safety whistle. Weighing in at less than an ounce and measuring 4.3 inches long, it's small enough to be carried on a lanyard, in a pocket, or in a pack. Wherever the destination is, it's always nice to have a backup plan.

Warning and safety information:
Cut injuries: The most common danger when using knives is the risk of cuts. Sharp blades can quickly penetrate skin and tissue.
Slipping of the knife: Improper or excessive pressure can cause the knife to slip, resulting in uncontrolled movements that can cause injuries.
Injuries due to falls: Knives should never be left unsecured or near table edges to prevent them from falling and injuring someone.
Blunt knives: Blunt knives pose a greater risk of injury as they require more force and can slip more easily. Knives should therefore be properly sharpened regularly.
Improper use: Using a knife for tasks for which it is not intended (e.g. as a lever tool) can not only damage the blade, but also lead to accidents.