reusable sandwich/snack bag Plastic toxic?

I have seen a lot of reusable sancwich bags and I really like the idea, but I just realized that not all plastic is safe to touch food.

I have seen some people fusing plastic from grocery bags & newspaper bags then using that as the waterproof lining for their sandwich bags. Those plastics were not made to directly touch food. Garbage bags were not made to directly touch food that will be consumed, so why would a newspaper bag. They come with warnings telling you not to use it to hold food that will be eaten.Plastic grocery bags aren't meant to directly touch food either... maybe the produce bags are safe to touch food.

I have seen shops that have reusable sandwich bags with PULL lining, wich is safe for diapers and can be sanitized (they use it in hospitles I think), but it wasn't made to touch food.

I guess if you are considering making something like this, you should do some research like finding out...
* what exactly makes garbage bags unsafe for food? (chemicals)
* do plastic grocery bags/newspaper bags contain dangerous chemicals (or whatever else you might want to use)
My biology professor warned us about the dangers of plastics.
(you shouldn't heat/freeze a plastic unless it was designed for that and even if it was designed for heating/freezing, doing so will make more dangerous chemicals leak out)

_____side note.........extra information....bonus mini rant ;)____
Use plastic for the use it was designed/intended for:
**do not store leftovers in plastic containers that came with food (a plastic cool whip container for example)the chemical composition of your leftovers are different from what was originally came in that container.
*acidic foods can cause certain chemicals to leach out of containers (I'm pretty sure your leftover chili will be more acidic than that cool whip that originally came in the container)
--(by the way.. heating anything with tomatoe sauce or that is oily in a plastic container will leave it stained and pitted = permanently damaged. so think about that before you microwave your spaghetti in your brand new tuppeware... opt for a ceramic or glass dish)--
______end of side note ______________________

You could instead consider using plastics that were made to directly touch food that will be consumed.
*bread bags
*produce bags
*plastic wrap (cellophane? saran wrap?)
*heavy duty freezer bags (like ziplock)
most of those things are one use items, if you fuse them together it would make them sturdier which would make them last longer. It may not seem all that environmentally friendly, but if you get 20 uses out of two fused ziplock bags that would be a good thing!


If you have any additional information, I would love to hear it... It you have url to for reference that would be great!


ps. I'll stay with my tuppeware for my sandwich needs until I get these questions asnwered... though the plastic in tuppeware should be questioned as well :/

http://www.etsy.com/forums_thread.php?thread_id=6592957