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Would these work as reusable sous vide bags?
No. They aren't rated for the heat (above 170F) and reusing sous vide bags is unsanitary anyway. There's no reason to use this over a regular zip loc or far cheaper vacuum seal bag.
Thanks. Sanitation is important. I was thinking if it was washable, it might be a good way to reduce waste, but it's probably not worth it. Who knows what chemicals/flavors/odors it might leach in to the food too.
Most sous vide cooking happens at 120-140 degrees, which is well below the 170F limit on these bags. I'm not sure how flexible the plastic is on these bags, but this would be an important consideration since the sous vide process relies on the bag conforming to the shape of the food so the air can all be expelled.
Lots of people here just use freezer grade ziplock type bags for steaks and fillets, and clip the bag to the edge of the water tank, with the zipper end above the water since zipper bags don't hold a vacuum on their own. The water pressure against the outside of the bag keeps air out below the water line. 4 cents a bag vs. $4 a bag?