I had another brand that was much more expensive and didn't work as well as this one. Just use a small plastic key to close the top of the zipper. Position the pump over the valve (you may have to wiggle it a bit to position it correctly). When the bag is fully vacuumed, squeeze the valve to close it to prevent air from being sucked back into the bag. It works and the pockets hold up pretty well. So far I've only had one bad bag that didn't work properly.
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