I have ID in my camelback usually, or I stick my DL in the leg of my shorts.

The Lifter of Heavy Objects has been a police officer, medic and fireman. He says the medics won't look in your bike/bag etc, but the cops might, eventually.

I like the idea of the id tags, cause they have a space for emergency numbers. I also like the idea of a label inside my helment.

Another friend suggested having something on your cell phone indicating what emergency number to call.