Most Canadian whiskies are blended multi-grain liquors containing a large percentage of corn spirits, and are typically lighter and smoother than other whisky styles. According to the laws of Canada, a Canadian whisky must be mashed, distilled and aged in Canada. It may contain caramel and flavouring in addition to the distilled mash spirits, and there is no maximum limit on the alcohol level of the distillation, so the bulk of the distilled content (often more than 90 percent) may be neutral spirits rather than straight whiskies. It must be aged for at least three years in a wooden barrel of not greater than 700 L capacity, and it must contain at least 40 percent alcohol by volume.