In North Carolina, it is illegal to have an open container of any alcoholic beverage in the passenger area of a motor vehicle. This applies regardless if the car is being driven on a public roadway or if it is parked. If you are charged with an open container violation, you could be convicted of a Class 3 misdemeanor if it is your first offense, and a Class 2 misdemeanor if it is a repeat offense.
An open container is any alcoholic beverage that has a broken seal. If the seal is broken, no matter how slight, it is considered an open container in the eyes of the law in North Carolina.