The KeyKeg's biggest secret is its inner bag which is tasteless and odourless. The bag ensures the superior barrier properties compared to other plastic kegs available nowadays. Oxygen ingress and CO2 losses are extremely low. Depending on product and market dependable requirements, the KeyKeg® can be supplied with a variety of inner bags.

The product quality and cost effectiveness of the packaging are compromised in the inner bag. Maximum shelf-life is over 9 months. Additionally, because of the barrier properties in the bag, the wine or cider can stay fresh for a long time after broaching the plastic keg.