Why DO “Corn Pops” come in that Foil bag?

Wikipedia has the answer!

The cereal is also known for going stale much faster than other cereals and is packaged in a different bag than normal cereals to keep it from doing so.

Great to know. I also now know that they’ve changed the name to just “POPS” as of January 2006… thanks to the Colbert Report. Stupid.