demijohn

A demijohn is a large, narrow-necked bottle traditionally used for storing, transporting, and sometimes fermenting liquids. Most commonly made of glass, demijohns are also found in ceramic or stoneware varieties. They feature a rounded body with a long neck and a stopper or cork; many are wrapped in a wicker or cane covering to protect the glass during handling and transport. Typical capacities range from about 1 gallon (3.8 liters) to 5 gallons (19 liters).

Historically associated with wine and mineral waters, demijohns are now commonly used by home winemakers and brewers for fermentation, aging, and storage. They are also collected as decorative or antique items.

The etymology of demijohn is unclear. The most frequently cited explanations connect the word to the French demi-jean or to a generic term for a half-sized bottle, though a definitive origin is not established.

Care and handling: Because they are made of glass, demijohns can break if dropped or exposed to sudden temperature changes. They should be cleaned with warm, soapy water and dried thoroughly. Use a stopper or cork that fits the neck and, for fermentation, an appropriate airlock if required. When not in use, store upright away from direct sunlight to protect contents and the bottle.