36 CFR §4.14

1. (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.
2. (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.
3. (c)This section does not apply to:
   1. (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. (2)An open container stored in the living quarters of a motor home or camper; or
   3. (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.
4. (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.