I spent a week diving in Bonaire. We were staying at Buddy Dive and were driving a Renault Duster Oroch. The key has electronics and we got a plastic dry container from Buddy Dive. But I had a DryFob already and decided to use it since it was more compact externally and the threads and double o-ring much more secur,e. The key, in a ziplock bag with some cash, fit in the DryFob without a problem. I have a clip tied onto the DryFob with cave line and clipped it to a d-ring. Didn't have any problems.