The bag sounds simple. But, I would not eat anything from hot plastic!
Some of the nerds on one of the backpacking sites did an in depth write up on it. They looked at all the materials and evaluated the safety of cooking in bags. Their conclusion was the name brand Ziploc Freezer Bags were safe. Other brands had a slightly different composition and weren't safe. It was convincing enough for me. I repackage my MH meals into quart bags to get the right portion size and to save weight and space.
