If I cook food in a plastic ziplock bag using boiling water, does it release toxins

[samhandwich22]

or cause cancer? As an avid backpacker, one of the most convenient and favorite ways to eat is to prepare "bag meals" with a bunch of dry ingredients (ie. couscous, dried cherries, instant potatoes, etc) and cook them by adding boiling water. I use "freezer bags" which are basically a thick type of ziplock bag. They can be sealed to let the boiled water cook the food inside for a few minutes.
The bags are thick enough so that they do not melt, but I have constantly heard rumors that boiled water in plastic bags can release toxins into the food or that it can even cause cancer. Of course these claims have never been substantiated.
Is there evidence (actual studies) out there that suggest boiling water on plastic does release toxins of any kind? I am not looking for opinions here, I need the facts.

 

[caveman1]

I really don't know I've heard plastic bottle with BPA can cause some effect But i don't know plastic bag from Rubbermaid or any other may cause some kinda reaction?

 

[nikos1]

it is a fact that they also do it in thailand...