In my office kit I have added a homemade "survival necklace. What you do is take a badge holder like this one:
http://img.alibaba.com/photo/50743642/Lanyards_With_ID_Badge_Holders.jpgRemove the badge sleeve ( you can use for a fresnel lens) and add a ring or D-ring to the lanyard. Attach a whistle, a small flashlight ..etc.
You can keep it in the bag. But in case of emergency, you want those items on your person, so you have the means to wear them like a necklace.