Barrel for at least two years in new, charred oak containers. Other forms of whisky aged in used barrels cannot be called "straight". International laws require any whisky bearing the label "Scotch" to be distilled and matured in Scotland for a minimum of three years and one day in oak casks. By Canadian law, Canadian whiskies must "be aged in small wood for not less than three years", and "small wood" is defined as a wood barrel not exceeding capacity. Since the U.S. law requires the use of new barrels for several popular types of whisky, which is not typically considered
Blended malt whisky single malt whisky produced from the same distillery is still considered a single malt whisky. The "malt" part of the term refers to the use of a malted grain to make the whisky. In Scotch whisky, this grain is required to be barley. Outside Scotland, whisky is produced from other malted grains, such as malted rye, and the term "rye malt whisky" is specifically recognized along with (barley-based) "malt whisky" in the code of federal regulations for whisky in the United States. Moreover, in much of the world, whisky is often made using grain that is not malted (for example,