Many years ago I was a scout and they told us NOT to use these containers for food as the film leaves some nasty chemicals in the container that cannot be washed out. Don't do it. This was even noted in an issue of Boy's Life magazine. Get yourself some of those vintage hula girl shakers instead.
http://www.miniaturebrainwave.com/2007/09/07/time-travelling-hot-dogs/
Neatorama Rules!