What is the old saying all that and a bag of chips?

Excuse me, could you please elaborate on the phrase "all that and a bag of chips"? It seems to be a colloquial expression, but I'm not quite sure of its exact meaning or origin. Is it used to signify that something is excessive or over the top? Or does it have a more nuanced meaning, perhaps related to being given a little extra as a bonus or incentive? I'd appreciate it if you could provide some context and insight into this saying.