These slider type zip bags are much easier for arthritic hands than the plain zipper, so I got these bags for my 90+ yr-old grandmother.  She would rather use tupperware for storing opened crackers & snacks (because they are reusable), but her hands just cannot remove the lids on them any longer.  So she rinses these out, hangs them to dry, and reuses them.  I wonder if the water used is worth it, but I would never mention this to her.