The film is much more rigid than that of cheap raincoats that you get at concerts for a few euros.
Since you fixed the film with a drawstring on the lens, I recommend to use only focusing lenses, otherwise rotates the film.
A little tip: I have the cord over the two smaller protruding "wings" of Geli pulled, so that the film during the extension of the objective of coming forward. With a little practice you can see the film not seen in the photos.
In the rain I have not yet tested. Holes or other damage I could not discover.