The Portside Flask is perfect for keeping your reputation for asocial behavior intact while maintaining a stylish image.
Unless they leak, all flasks are pretty much functionally equal. This one is beautiful. I get compliments on it at every tech conference, panel, or event I attend. Usually by people standing in the back of the room, near me, who wish they'd thought to bring a stiff drink.
I can confirm this flask works well with Bourbon, Irish Whiskey and Rum. It is super durable, I've had mine since 2010 and never lost a drop.
Cork Pops Nicholas Portside Flask via Amazon