The traditional Jack of the medieval tavern was sometimes coated both inside and outside with pitch or blackjack. A common trick, and one for which an alewife was pilloried in 1350, was giving short measure by half filling the jack with pitch.

Small Medieval Jack (left) and Large Medieval Jack

• Capacity of Large Medieval Jack One pint - Approximately - Cost £30.00.
• Capacity of Small Medieval Jack Half pint - Approximately - Cost £21.00.