Why dont they, in juice boxes, ever create a slight suction to compensate for adding the straw?

the straw is filled with air and atmospheric pressure will force that air in the stalk of the straw to displace an equal volume of juice. just like how some juice bottles have a slight vacuum that holds a clicker cap in.(snapple). but in a juice box it allows for a straw to enter without some juice dripping out. i lost a good pair of pants because of a poorly engineered grape juicebox.