Do I need a waterproof or just water-resistant organizer?

For airport, hotel, and rainy-commute use, water-resistant fabric with a standard (non-sealed) zipper is enough, that's what nearly every pouch in this category offers. True waterproofing (sealed zippers, welded seams) is overkill unless you're kayaking with the bag. Reviewers note that even "waterproof" claims on budget pouches typically refer to the Oxford or polyester shell, not the zipper line.