Anywhere you can't take a traditional hip flask, you can probably still take a mobile, and the thing where you turn it upside down and, er, suck on it, you can rationalize as an attempt to improve reception... Likely your ability to explain away this little accessory will become more deft as you become more attached to it in any case. Speaking of case, comes with a little leather one that attaches to your belt, since it's that extra touch that makes people think you still have your life together. $13. [GT]
Cell Phone Flask, 4 Oz [via Pocket Lint]
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www.cellphoneflasks.com has the cell phone flask for sale for only $7.95. They can even personalize and engrave it. I've ordered engravable flasks from them as groomsmen gifts for my wedding.