Works with greens, celery, all herbs, I think it has to be leafy to work... Pretty sure a tomato, zuchinni and squash are a no go.....LOL
I had always prep'd my stuff when I got home from the grocery (comes from having a garden all my life), then ziplocked. But then learned about a single wrap of wet paper towels and it keeps the crispers full now instead of me throwing out mushie and re-buying. After wrapping with the wet paper towel, the newspaper plastic protective sheaf keeps it from dehydrating. Or a zip-loc for small stuff. You can actually just throw a damp paper towel in a ziplock bag with something that you want to keep hydrated.
I am really glad it helps you.