My opinion is to stay away from paper anything... I also think its better to have the eggs on there side. Not saying cartons are bad. If you have a tall incubator you can put them in cartons an tilt the carton to have the eggs on there side still. If not you can cut the cartons in to 1 egg wide strips an then they will be in cartons held still but still be on there side. I really don't think rolling around hurts them any though. But if you do thin fine but there is no reason to stand them on end to hold them still. I know If I was stuck in a barrel I would have an easier time getting out if it was on its side.