Is anybody else pissed off about the amount of air that fills a bag of cereal?

I just bought a supposedly jumbo bag of cereal and 2/3rds of it was filled with air. There's some bullsh*t on the package about vacuum sealing and needing a certain amount of air. What a load. They're ripping us off! Is there no consumer advocacy that can help grocery shoppers? The company says the grams are clearly and accurately marked on the box. Why the ridiculously big bag? It's just the same amount that used to come in a normal box, but now they put it in a bag big enough to house a small baby. WTF?