I currently wear a "dog tag" made by the Verbatim company that has an integrated 16 GB USB drive. The "dog tag" looks like analog predecessor at first glance but on closer inspection you can see the USB drive.
I have placed an open file that gives basis pertinent emergency information and contacts on the drive in Word 2003 as well as encrypted files with other necessary information in case SHTF. A wide variety of information is included such as family members medical history and Rx information. Vehicle information, photos and a myriad of other data is included. In a post disaster environment, if a working computer that runs Windows can be found I should have the information I need for any urgent problems.
I have no association with the Verbatim company except as a customer.