RubberGirl tried the most heavy inflatable rubber bag in the world. It is made by Rubbers-Finest from Germany. Also the mask is extremely heavy and breathing is restricted by the build in smellbag She was in for over an hour and loved the total enclosed feeling. The bag is so strong and heavy that escaping is not possible. She is completely sealed of the outside world. The rubber prison warden added a vibrator to her to orgasm several times