36 CFR 4.14: Open container of alcoholic beverage.

(a) Each person within a motor vehicle is responsible for complying with the provisions of this section that pertain to carrying an open container. The operator of a motor vehicle is the person responsible for complying with the provisions of this section that pertain to the storage of an open container.

(b) Carrying or storing a bottle, can or other receptacle containing an alcoholic beverage that is open, or has been opened, or whose seal is broken or the contents of which have been partially removed, within a motor vehicle in a park area is prohibited.

(c) This section does not apply to:

(1) An open container stored in the trunk of a motor vehicle or, if a motor vehicle is not equipped with a trunk, to an open container stored in some other portion of the motor vehicle designed for the storage of luggage and not normally occupied by or readily accessible to the operator or passengers; or

(2) An open container stored in the living quarters of a motor home or camper; or

(3) Unless otherwise prohibited, an open container carried or stored in a motor vehicle parked at an authorized campsite where the motor vehicle's occupant(s) are camping.

(d) For the purpose of paragraph (c)(1) of this section, a utility compartment or glove compartment is deemed to be readily accessible to the operator and passengers of a motor vehicle.