Scott, the key kegs are available in two different forms - All of them use a PET Plastic (the same as a 2L soda bottle) for the outer shell. The 20L versions look either like a very large soda bottle, tall and skinny, and are pushed direct with CO2 or mixed gas as a standard keg. And there is the internal bladder style, where no outside gas comes in contact with the beer. These are completely spherical... And they can be pushed with atmospheric air, no more worries of maintaining carbonation levels, etc... Pressure is set to control dispense speed.
20L of beer in a plastic sphere looks weird, esp as the bladder begins to shrink. From what I gather, they couldn't get the tall skinny ones to work with the bladders, as they would bind up before all the beer was dispensed, but the spherical ones work well with the bladder system.
These are dropping now in markets with good import volume from some known breweries, but I don't expect to see the disposable / recyclable kegs used by any domestic producers for quite some time...
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