Interesting info Scotch, thanks. I have never had an issue with the bags catching fire and none of them ever exhibited any signs that they were even close to that happening so for me that is not an issue. I always stand close watch over the bag anyway because you have to shut the microwave off as soon as the popping slows down, so if there ever was a fire I would be right there.
As for them being sanitary, they are bags that are used for lunches so I am not too worried. Food has been put in those since at least as long as I have been around. I do not think they would sell them for that purpose if there was a major problem doing so.
The fumes from glue is not something I had considered though. To be honest, I doubt it will keep me from doing this even if it is not the safest thing in the world, but at least if/when I get sick I will have a better understanding why