California Code, Civil Code - CIV § 2180

A common carrier of persons, unless his vehicle is fitted for the reception of persons exclusively, must receive and carry a reasonable amount of baggage for each passenger without charge, except for an excess of weight over one hundred pounds to a passenger; if such carrier is a proprietor of a stage line, he need not receive and carry for each passenger by such stage line, without charge, more than sixty pounds of baggage.