What’s a single-barrel bourbon?
When distillers are making regular bourbon, they go to their rickhouses, the buildings where the aging whiskey is stored, and pull out a bunch of barrels. These barrels are then dumped together in giant tanks and mixed until they fit the flavor profile of the bourbon they’re being bottled as. Each barrel tastes slightly different due to subtle differences in the wood, location where it was aged in the rickhouse, its age, etc. However, you can blend hundreds of them together to get a relatively consistent flavor for each batch of bourbon. This large-scale mingling process is why Jim Beam white label always tastes like Jim Beam white label.