I think I have already mentioned the "survival necklace" I made, and then made more copies to include in every kit I have. Take a ID badge lanyard, remove the ID plastic sleeve ( save it for a fresnel lens or alchol wipes ..etc.)

On the lanyard, start hanging your favourite type of whistle, folding knife, tiny flashlight ..etc.

In case of emergency, the first thing to do is take the necklace out of the nearest kit and hang around neck. Tools go under shirt or inside chest pocket. They will be your last ditch tools (on your person no matter what).

Some on-line companies sell ready made survival necklaces but restrictions on either side make it a better option just to be McGyverish and MAKE DO !!!