Sue is right on! (We should have a sticky for this topic)
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I think something like medic-alert that you wear, that can't be mistaken for something else is better than something that can be overlooked. Having your up-to date medical info (per the list posted here
looking for hospital personnel) in your most identifiable 'personal space' i.e. wallet, passporter pouch, jogger pouch, fanny pack, what have you will help us to figure out what is wrong and help get you on your way fastest, is the best thing to do (That said, many of us are hesitant to rummage through patient's wallets, because people can misunderstand what we are doing). Inform your traveling companions of where you keep your info is most helpful. It can really slow things down when 20 people are saying 'she has this problem', 'she has that problem'. Your companion animal may or may not be present (for any number of reasons) while you are being examined. Most likely, you will be fine during your trip, but please be prepared!