If you’re still eating Kellogg’s Raisin Bran, you are a fool. Using Kellogg’s own metric for the value of a raisin-and-bran cereal (the amount of raisins) there is a vastly superior option.
The Compliments: Maximum Raisin Bran cereal has so many god-damn raisins in it there should be a warning on the bag. It’s awesome.

Speaking of that bag through, it sucks. The bag has a “resealable half-zip” that has come pre-broken on every bag I’ve ever bought. If you designed this bag – have you ever used it? So many raisins though.
The issue of Ziploc-like seals on bags of packaged food products is one I think about often. Your raisin bran is not alone in having a substandard version: as a rule, most attempts fail. They can’t be sealed, or they can only be half-sealed.
The only consistently successful approach is the one that Bob’s Red Mill products use, which is more keen to Velcro than Ziploc.