This bag sealer is incredibly strong and it really works. When you fold the top of a plastic bag, the Gripstic slides across the entire length of the crease, creating a seal that can stand up to vigorous shaking. One tip: Make sure you pull, not push the Gripstic across the fold, says Daily Grommet’s Jen Lockwood, who tested these super sealers in her home. Food stays fresh longer, and it stays put (so no more fragments of frozen vegetables scattered at the bottom of your freezer). The Gripstic is recyclable, dishwasher safe, and made from plastic that’s BPA- and phthalate-free. They’ll save your food — and your sanity.