With the hidden bladder flask, you’ll be able to conveniently conceal the sweet life-giving nectar that is alcohol. The bladder flask, like its name suggests, is a small bladder-like pouch that holds up to 32 ounces of liquid and attaches to the waist so beverages can be transported without anyone knowing. The flask is equipped with a handy and spill proof nozzle that can be poured into a cup – just unzip and pour away. A genius invention, the only downside is that you give off the appearance of drinking your own urine but it doesn’t matter because the end result is worth the social awkwardness. It also works great for passing drug tests!