Not many people are going to want to fill 5 full liters at their local taphouse, but with the Bubba and a Pro Tap Kit, you could.
This bad boy is actually intended for home brewers who want to craft small batches with something like a PicoBrew. Or, the Bubba is perfect if you want to transfer 5L from your corny keg into something more portable.
With the Mega Cap and its standard quick-disconnect posts, transferring from one keg to the other is a breeze. You can even use your larger CO2 tank to force-carbonate in a Bubba, and then you simply snap on the Pro CO2 Regulator for portability.