"Hmmm," Theo said in thought. "You know there are only rules around the charm due to the International Statute of Secrecy, theoretically if a muggle were to see fifty witches and wizards exit a phone booth all at once there would be consequences. I can’t imagine that a muggle is going to see the interior of a bag - that is unless you planned to use it on something else?" He looked pointedly at Malfoy's crotch.