I second this. I think 101 N will be incredibly dense, and while 880 can be, if you hit it earlier and use carpool lanes, it should be much easier.

I also find 80 to the Richmond-SR Bridge far less congested to not congested than I would find 101 all the way up to Napa. It's taken me many hours to get anywhere on 101 N past the GG Bridge on the weekends... Even the weekend DAYS.