We have found them to work as advertised. We stretch the corner with the valve to the edge of the table (support the rest with the knee) and hold the valve in a horizontal position, put the depressed piston on the valve, pull up and you will hear a small pop when the valve opens and the Air is sucked out. Repeat this about 10 times and you have an airless bag. Not sure about durability, but so far so good.
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