These Peanut Lighters are incredibly tiny and dunk-proof. They may be the smallest lighter going and I've been really happy with mine. It has a permanent place on my keychain. (I'm amazed the lighter fluid doesn't evaporate. Try that with a zippo! grin)

There are a couple of other sources for them online, but CountyComm has always done right by me. (No affiliation, just a happy customer.)
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"When I read about the evils of drinking, I gave up reading." Henny Youngman