Here’s information from the state ABC:
https://www.abc.ca.gov/notice-of-regulatory-relief/
In addition to selling manufacturer pre-packaged containers as provided above, ABC licensees selling beer, wine, and pre-mixed drinks or cocktails not in manufacturers containers for consumption off the licensed premises may do so when sold in conjunction with meals prepared for pick-up or delivery either by the licensee or by a meal provider. Any such alcoholic beverages must be packaged in a container with a secure lid or cap and in a manner designed to prevent consumption without removal of the lid or cap (e.g., no lids with sipping holes or openings for straws).
Further, any licensee selling such beverages for off-sale consumption shall prominently post the following warning in a manner that puts consumers on notice of limitations regarding open container laws: Alcoholic beverages that are packaged by this establishment are open containers and may not be transported in a motor vehicle except in the vehicle’s trunk; or, if there is no trunk, the container may be kept in some other area of the vehicle that is not normally occupied by the driver or passengers (which does not include a utility compartment or glove compartment (Vehicle Code Section 23225)).
Further, such beverages may not be consumed in public or in any other area where open containers are prohibited by law.
“Post” means to prominently display on the premises, post online, or present in whatever manner is necessary to ensure that the consumer purchasing, or delivery person transporting, such beverages is given notice of this warning.
