I stuck both of mine on my key chains next to all the reward cards. I figure if I lose my keys in a familar place at least people would know it's my keys. Plus it looks a lot better than any of those ugly reward cards.
I also have plenty of Continental tags on my luggage already and the ones in the mail seem like they will break easy so key chain is a safe home for them. Less damage.
These are luggage tags.

Easy to spot my suitcases with those blue bag handles.