If you have medical conditions - MedicAlert http://www.medicalert.org

Have been a member for years, got used when I was hauled to the ER after learning the hard way that I have a food allergy.

They have bracelets, necklaces, ankle bracelets. Medical professionals have access to the records you have with them - medical conditons, medications, your doctor's numbers, next of kin. There is an annual membership fee.

In my Bento box on my bike I keep a spare insurance card, my doc's office card, and somesort of ID - if I'm riding from the office I have my military ID card that I need to get back in the compound. Not exactly a phone number of next of kin, but then if *they* explored my phone - my mother's number is under "Mom". Trust me as a former EMT, exploration for ID can get rather brazen when the need arises, you just need to have the thing on your person somewhere.