Keg: A keg is a larger container, typically ranging from 5 to 15 gallons, used for storing and dispensing beer in bulk. Kegs are commonly used by breweries, bars, and restaurants, and they require specialized equipment (like a tap system) for pouring.
Growler: A growler is a smaller, portable container, usually between 32oz and 128oz, used to transport beer from a taproom or brewery. Growlers are designed for personal or small group use and are sealed with a cap to keep the beer fresh.