What is a unique feature of Key Kegs regarding their internal structure?

Key Kegs have a distinctive internal structure consisting of an aluminum-coated bag that is housed within a rigid outer shell. This design allows the bag to collapse as beer is dispensed, preventing air from entering the keg and thereby preserving the quality and freshness of the beer. The aluminum layer provides added protection and durability, ensuring that the keg can be transported and stored efficiently.

This innovative design contrasts with traditional kegs, which are generally made of metal or plastic and rely on CO2 for carbonation. The use of a bag inside a rigid casing allows the beer to be dispensed without the use of added gases, minimizing oxidation and spoilage. Key Kegs are also designed to be lighter and more portable than conventional kegs, which enhances convenience for both brewers and retailers. This feature is significant in maintaining beer quality and efficiency in serving, making it a prominent characteristic that sets Key Kegs apart from other keg types.