Umm... if all you do is pour hot water in them, you're not cooking with them. It's not even boiling any more by the time it gets into the bag.

That said, I tend to dump the meal into a bowl (also plastic, usually one of the ziploc screw top deals with a reflectix cozy) and rinse and re-use the bags. Not because I'm afraid of BIG BAD PLASTIC but because I'd rather re-use and recycle it.

Dude, where are all the three armed, ten eyed people? Plastic's been around alot longer than teflon, and guess what's more dangerous? They're discontinuing teflon....