Carboy

Large plastic bottles for a water dispenser
A 25 L (6+1⁄2 US gal) glass carboy acting as a fermentation vessel for beer. It is fitted with a fermentation lock.
A Bulgarian demijohn (damadzhana)

A carboy, also known as a demijohn, is a rigid container with a typical capacity of 4 to 60 litres (1 to 16 US gal). Carboys are primarily used for transporting liquids, often drinking water or chemicals.

They are also used for in-home fermentation of beverages, often beer or wine.