Adding a military style identification tag to your key chain isn't just for recovering lost keys... It may also save your life. First responders, medics, and doctors are trained to look for a Medical Information tag to alert them of your chronic health conditions in the event that you are unconscious.
A brief and easy to read description summarizing a few of your key medical facts such as blood type, allergies, hear conditions, etc. can be invaluable to ensure that you receive proper treatment. Don't forget to add an ICE (in case of emergency)  phone number so that a loved one can also be contacted.

The aluminum capsule is great for carrying medication or extra instructions along with your dogtags. Use for pills, money, tinder, weed or anything you need to keep dry.

The key-shaped knife, is ideal as part of an every-day-carry item on your keyring. 

"My guitar is not a thing. It is an extension of myself. It is who I am." - Joan Jett .
Help prevent loss and theft of your musical instrument (specially when it doesn't have a serial number) with its own identity dogtag. Make sure to put your name, phone number and any other helpful information for anyone who finds it.