It's Not Rocket Science, People
I always have at least two kinds of cereal on hand, so I'm a bit of an authority on the dynamics of cereal box packaging.
Most of us know the flimsy little closure tab on top of the box is worthless, especially when the box bulges when you have to roll the top of the inner bag to keep things fresh.
My burning question is this: why can't the cereal companies use a Ziplock to close the inner bag? How much more could it possibly cost the cereal companies, when it's obvious the cereal would keep much longer and make consumers happier?
Besides, we all know they'd pass on the extra cost to the consumer, so what's the problem?