I would put the tubes in the critter keeper, (for about 5-10 minutes), let them all climb in there, and then dump them into another container. Do this several times or until you get all the crickets out of the keeper. Somebody here on the forum, I can't remeber who, said that a hand held vacuum works wonders for transporting crickets as well.
I've had to the past take each cricket out one by one, and belive me it's not fun. :P