Stainless Steel Drinking Flasks And Pocket Flasks For Alcohol. Carry A Drinking Flask With You To Restaurants And Bars. Drinking Pocket Flasks Are Often used to conceal alcohol in your pocket. Bring a flask to your favorite restaurant, order a coke and as soon as the waiter walks away add your favorite alcohol from your flask for big savings! Drinking flasks also make a great gift for grooms men, or anyone.