For folks that always try to sneak in booze to the movie theater, Disneyland, work conferences, etc. there's a cool little product for you on Amazon's "Home and Kitchen" department.
Sorry, guys, but this one might only help out the ladies as a five-pack of "Tampon Stealth Flasks" provide a hiding spot for alcohol that can easily fit in a purse, or even your back pocket.
Granted, it means you'll eventually have to pull out the tampon flask and get some funny looks when you drink out of it. However, desperate times call for desperate measures.
Not sure what the male equivalent to this incognito flask might be, but somehow a Jockstrap Stealth Flask doesn't sound like a good idea.