How much luggage is allowed one way to San isydro ca. And how much a ticket for two

I ride limousine buses and you can carry a hand bag or small suitcase and under two suitcases

Your carry-on bag, and your first piece of luggage that goes under the bus is free. After that it costs.

I'm thinking it depends on the bus line you go.on lots of busses stop there greyhound flix bus and many more