Dexcom G5 waterproof receiver case

So this past weekend I was out on the boat and I had my receiver in 2 Ziploc bags. Some how water made its way through both bags and saturated my receiver. It vibrated itself until the battery died and now I'm $240 down from next day shipping a new receiver. I tried the bag of rice trick but that did nothing. So what do you guys do for a waterproof case? Does someone make one? I'm very surprised dexcom doesn't have them on their site. Was just thinking of getting one of those hard waterproof cases but I want something like a lifeproof phone case that is snug.