Amazon.sg:Customer reviews: [4 pack] Sous Vide Magnets to Keep Bags Submerged and In Place - Sous Vide Accessories to Stop Floating Bags and Undercooking - Great Alternative to Sous Vide Weights, Balls, Clips, and Racks
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I read the review and I've used my magnets (4=2 pair) six or seven times. They have worked great to hold small bags submerged. You can use one magnet to help retrieve bag after cooking by leading the magnet and bag up side of the container. I have had no issue with the magnets loosing strength or the coating flaking as I saw in a negative review. I am happy with my purchase. If you are sous vide cooking for one or two persons they magnets offer a flexible alternative.
These are great, I might get a second set in case I do some larger batch cooking, but we've been able to keep everything under water with just these 2 pairs. They are strong enough that you can double up bags and they still hold two bags easily. We are also able to drag the outer magnet slowly, and the inner one will follow- so I can move bags deeper into the water bath by gently moving the magnet, and I don't have to reach in.