California Code, Vehicle Code - VEH § 23226

(a) It is unlawful for any driver to keep in the passenger compartment of a motor vehicle, when the vehicle is upon any highway or on lands, as described in subdivision (c) of Section 23220, any bottle, can, or other receptacle containing any alcoholic beverage that has been opened, or a seal broken, or the contents of which have been partially removed.

(b) It is unlawful for any passenger to keep in the passenger compartment of a motor vehicle, when the vehicle is upon any highway or on lands, as described in subdivision (c) of Section 23220, any bottle, can, or other receptacle containing any alcoholic beverage that has been opened or a seal broken, or the contents of which have been partially removed.

(c) This section does not apply to the living quarters of a housecar or camper.