Naggin
A naggin (sometimes spelled Naggan) is the name used in Ireland for a small bottle of spirits, often of vodka or whiskey. A naggin contains 200ml of liquid[1]. The next size up from a naggin is 350ml in volume, often called a, "super-naggin" or "double naggin", despite falling short of truly containing twice the amount of fluid the next size is 700ml this is known as a "shoulder". Naggins, particularly those of inexpensive vodka (such as Huzzar), are popular among youths and students (including the famous 'Naggin Neil'). They are often consumed shortly before going out for the evening and/or hidden in socks. Sean Glynn once got very intoxicated, after consuming just half of a naggin.
Although the smaller size is the same as the volume of a Chopine of wine, the bottles are usually significantly different in shape. The naggin bottle is typically short and flat, suitable for placing in a pocket, whereas the Chopine typically has a round cross-section. Whether made of glass or plastic, the naggin is rarely as thin as a metal hip flask.
References
[1] http://drinkaware.ie/index.php?sid=11&pid=107
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