I don't think Shasta's line of sodas are around anymore, but they sure did give Pepsi and Coca-Cola a run for their money in the 60's & 70's. I think Shasta faded away somewhere around the early 90's, I'm not sure, but by then, it was reduced to being a 3rd-tier brand of soft drinks. No advertising, and you could've probably gotten two six packs for $10.
Back in 1978, Barry Williams, fresh from the disaster of The Brady Bunch Variety Hour, was cast as an Off-Broadway actor in this spot. Casey Kasem is heard doing a voice-over near the end of the spot.
It's too bad Shasta's diversity in flavors wasn't sustained in the long term.