— classical are flat metal flasks of small volume (usually up to 300 mL) with a narrow neck that can fit in the pocket of a jacket or hiking pants and are equipped with lids with a loop (see "Functions / Features"). The main purpose of such flasks is the storage of strong alcoholic beverages such as cognac or rum. At the same time, the narrow neck facilitates pouring into glasses and even allows you to drink comfortably straight from the flask; however, for the same reason, filling a flask is possible only with a special watering can.

Such products are often decorated with original drawings, engravings and reliefs, and also finished with additional materials (like leather). Thanks to this, the classic flask can also play the role of a stylish accessory.