breathing bag from EPDM

From the experience in the construction and test of the breathing bags of pendulum rebreather has become apparent that the installation of the scrubber, especially in cold temperatures, is not so simple. I search after a more flexible material and found it(thanks Uwe ).... Also pond foil, but from synthesized rubber, EPDM.
This type of counter lung very well-tried since 2 years in freshwater and saltwater.