Unlike with the terms cask or barrel, the phrases single cask and single barrel can be used interchangeably. Just like single malt, these are terms that are evocative of quality within the world of whisky. However single malt and single barrel/cask do not mean the same thing. A single malt whisky refers to a beverage that has been made at a single distillery but blended from different vattings or casks. Meanwhile, a single barrel/cask refers to a whisky that is sourced from a single cask. As such, the latter tends to be stronger in terms of alcohol content.