Just transferred 3 gallons of my alaskan amber clone to a smaller keg to take to pittsburgh for this weekend's hockey tournament. This is a much better solution than using the big ones. Transferring the beer is REALLY easy, too. Just put together a cable with 2 of the black "output" connectors on it, lightly pressurized the small keg, and then hooked up full pressure to the big keg. As it filled, just purged the gas occassionally until it was full. Then pressurize the keg and boom, done.