According to the description,
And the pictures. Its air-filled edges make the case float easily in the water,...
They're fooling us! The edges are neither filled with air, nor does it float.
But it shows in the pictures and specifically, for the phone case there are no air-filled edges,
And it doesn't float

If you carefully close all the zippers, nothing gets through! It fits just a small wallet and the phone, maybe a car key too, basically the essentials so they don't get stolen. Very good.

Great bag.
I bought it for surfing.
I remember getting swallowed by a good wave. I was impressed that the bag was still on me and to my surprise my phone and documents had still zero humidity.

Both the case and the pouch were tested in a gorge, where in some cases the water exceeded 2-3 meters. They kept the phone and keys intact. 100% satisfied.

it does its job. the phone doesn't slide in very well from the inside, but maybe that's just my impression

It does its job and then some, it won't take in water but I definitely wouldn't test it in depth. Personally, I got it to put my phone and keys inside and take them with me for spearfishing, so the case sits on the surface with the buoy. It floats, both the pouch and the phone case. For the price, it's worth even more

The cases are waterproof and absolutely safe to go into the water. They are also very durable with the only flaw being the elastic of the waist case, which loosened a lot after just two summers and minimal use in water.

Best purchase of the summer so far, very useful to keep valuables close while swimming at the beach.