Every Witz case I've ever had...four of them...have failed me. I've been to all the water parks here in FL and in every instance every "waterproof" case I've used has failed. The Witz closure system is a joke, in my opinion, and open way too easily. Everything else is just too bulky. I'm at the point of considering these:
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All I need to do is use an internal gasket and it should be fine. Found this at my local WallyWorld in the nutrition section. It holds some kind of protein shot, but I got it just for the container. I carry my cell phone emergency charger,a AA battery, and the Bic in it. Plenty of room for more, but I got like 5 of these things for various purposes. My nephew got a bunch of acrylic tubes with caps similar to these at Ace hardware a couple years ago, if that helps.