The Party Pig® is a self contained 8.5 liter (2.25 gallon) reusable beer package/dispenser. The package requires no CO2 tanks or cartridges because it uses a self-inflating pressure pouch. As beer is dispensed from the PET plastic bottle, through an attached push-button valve, the internal pressure pouch expands and maintains a constant 15-20 pounds per square inch of pressure. This is accomplished by combining citric acid and bicarbonate of soda in a controlled manner to produce CO2 gas, which remains inside the pressure pouch and does not come in contact with the beer.
Everything is reusable except for the pressure pouch. With care, the components will last for many years.
The Party Pig® is manufactured and marketed by Quoin (pronounced "coin").