We also have boxed milk. The bags are just for large quantities of milk. It also doesn’t go bad with a tiny hole open to the air. A bag of milk, in a picture, will last for at least a week with no clamp on it.
Mike has seen his father do this task at least 10 times before. He should know. Also, a modicum of thought would indicate you do not put loose tiny items in the car.
*pitcher