Cookability

Pretzels too! Also any kind of prepared/instant soups, flavoured rice pouches, ramen, that sort of thing. Even the organic stuff I've seen (less preservatives, hopefully) are still pretty high in salt. Packaged white bread has a surprising amount of salt. Most seasoning blends (like for taco meat) are similarly mostly salt.

I would maybe suggest looking at lists of things that people with high blood pressure are advised to avoid, since opposite ends of the sodium spectrum and all...