1. Capacity: 20.5±0.25L It can meet requirement by clients to fill exact 20L beer into kegs. There will also be extra space for air pressure to prevent damage to rubber parts of spear. 2. Overal height: Stackable keg: 600±2mm Unstackable keg: 590±2mm 3. Diameter: 233±2mm 4. Tall and slim kegs will save space of storage for you.