Glass Supplier

I am looking for a way to seal a plastic container. I basically need the cool whip style container with a thin plastic film that you pull off. I have the containers but need to find that thin plastic film. I have looked for suppliers everywhere and cannot find how this process is done much less where to buy the film. I would love links to the products if you could find such a thing.

you use cling film and hair dryer or paint stripper hot air one practice you will get hang of it