When I looked at these things I thought they looked stupid. I thought they couldn't work. But it makes more sense once you see how it fits. You fold the bag and insert that crease between the yellow piece and the colored plastic sleeve. It makes a pretty tight seal. The result is similar to a Ziploc package. However, do not try to use it on fragile plastic bags. Unless it's a bag that can already give you a nice crease like any bag of chips, it won't help.
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