I tried the fabric test but no water got into the bag. Decided to try the phone. I have an iPhone 6 with a case and a pop socket on the back. It fits in a pocket. I don't have a larger phone to try, so I'm not sure if any of the larger iPhones will fit. I filled the large sink in the laundry room with water to see if it floated. It did!. The top of the bag, where you snap it open, was above the water. I would attach a photo but there is no other phone to take a photo. I think if he fell in the water I could find him. Again, I'm not sure a bigger or heavier phone would swim, but mine did.
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