^^^ this has been my biggest concern. I dove with a computer that had a watch style band and an extender when diving dry. At one point i was diving in florida and looked at my arm to find my computer was missing!! Fortunately i found it with a couple minutes of retracing my dive, but found that one of the pins had failed and that was enough for the whole computer to effortlessly sink to the bottom . For that reason a double bungee is a must in my opinion.