UNIVERSAL 防水袋 - 附腰帶，讓手機與貴重物品保持安全乾燥，非常適合划船/游泳/浮潛/泛舟/海灘/泳池/水上活動/公園 - Casebus

Took this snorkeling in rough surf and my phone came out completely dry, the strap held tight around my waist the whole time. The seal is easy to close even with wet hands, and there's plenty of room for keys and cash alongside the phone.

The waist strap is what sold me, and it held my phone snug while I snorkeled for a solid hour without any water sneaking in. I even clipped my keys inside and they came out bone dry. Perfect for beach days where you don't want to worry about a thing.

Took this on a kayaking trip and tossed my phone, keys, and cash inside without a second thought. The waist strap stayed snug the whole paddle, and everything came out bone dry even after a few splashes.