This site claims that regular baggies are suspect when dunked in semi-hot water for hours. They go on to say that a vacuum sealed variety was rated safe, though not sure what sort of verifiable testing has been done:
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I did some serious digging, y'all. And luckily, I learned that there are some bags on the market that are indeed safe for sous vide purposes, and pose no problems from a BPA or EA perspective. The key is to stick with vacuum bags that are free of BPA, phthalates, and other plasticizers. It’s the plasticizers – chemical additives like phthalates that increase the pliability and fluidity of the plastic – that contain EA.
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Cooking Sous Vide: Plastic Safety | Award-Winning Paleo Recipes | Nom Nom Paleo®
The cynic in my hopes this isn't someone plugging their own product.