The S4 is so new, we haven’t found a tailor-made waterproof case for it yet. One of the best go-to dry bags for large phones is the Eco-Fused which bears an IPX8 rating (meaning it can be continuously submerged beyond 1 meter.) It closes by folding the top and pushing in the two sliders, and you can still operate the touch screen and take photos through the bag making it great for underwater shots.
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