Your high flying helium filled balloons can express a variety of occasions. Why not let the balloons express how you feel? Your balloon bouquet is sure to get a rise out of who ever you send them to. 6 Mylar Birthday Balloons Make it more special by choosing from the ADD-ONS below. Please understand that Latex Balloons may only last 4 to 8 hours while the Mylar Balloons will last several days. Some of the balloon designs & or flowers may vary but the over look & value will remain the same.