I couldn't find anything with search. I do a lot of shore diving and have a dumb key that opens my car door, so I can take it underwater while shore diving and lock my car. I'm going on vacation at the end of the year, hoping to get in a couple of shore dives on the days we don't go out on boats. Since I'll have a rental car, I will probably have be an electronic key with a swaged steel cable, and any other crap the rental car sticks on the steel loop. Does anyone have any DIY suggestions for a reasonably foolproof way taking electronic keys diving and making sure they work when back on land? Zip lock baggies leak. I'm thinking of using an old GoPro underwater housing if nothing better comes up. Does anyone make small cylindrical waterproof delrin containers with a screw cap, kind of like an empty can light can, for storing small stuff and keeping it dry?