One quick way to lug around a 2.5-gallon keg is with MoreBeer’s Tote-A-Keg. One potential drawback, it costs $150.
It uses CO2 to dispense the flowing beery goodness through an outer spout. The handle and wheels make this device easily the best accessory of any drinker. Being an alcoholic is damn expensive, I should know, my Tote-A-Keg is on the way