California Code, Civil Code - CIV § 2205

The liability of any stageline, transfer company, or other common carriers operating over the public highways for the loss of or for damage to any baggage shall not exceed the sum of five hundred dollars ($500) for each trunk and its contents; two hundred fifty dollars ($250) for each valise, suitcase or traveling bag and its contents; or two hundred fifty dollars ($250) for each box, bundle, or package and its contents, unless a higher valuation is declared at the time of delivery of such baggage to the carrier and assented thereto in writing by such carrier.

All baggage presented to the carrier for checking shall be appropriately tagged by the owner with his name and address.