Very strong magnetic field. Putting them together on each side of the bag or one inside and one outside the pot to keep the bag in the water works great. However, they won't work if you're trying to attach just one to the rim of a curved metal pot. The curved pot prevents a strong magnetic hold. I don't mind using 2 together but they are too expensive to buy more. If you have a vacuum sealer and most of the air is sucked out of the bag, the weight isn't needed anyway.
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