My buddy and I are about to head to Curacao for our first experience with shore diving. We will be driving to various dive sites and are unsure about what to do with car keys, drivers license, credit card or cash (enough for a beer or two after the dive) while we are diving. Can't leave it in the car, so I assume it has to go in the water with me. Can anyone recommend a dry case or bag just big enough for the essentials that is actually waterproof? Or is there a better approach? Thanks!