I'm pretty sure most freezer bags would leach carcinogenic and endocrine disrupting chemicals in to the food when you boil them, unless you used bags specially designed for cooking. Even then I still don't trust them.
I would have thought the same but I'd love to know if anyone has any definitive proof of them being unsafe.
That being said, you'll rarely see anything being cooked sous-vide at more than 90°C and the bags for that are made from slightly specialised materials, so there might be a grain of truth in boiling the hell out of 'normal' bags.
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