Waterproof Pouches

Protects against salt water and sand, which IP ratings don't. Touchscreen works through the window. Most designs float.

Photos through the window are noticeably softer. Face unlock usually fails through the plastic. Cheap seals fail.

Test every new pouch empty first: seal a tissue inside, hold it under water for a minute, check the tissue. Two minutes, and the only way to know before your phone is inside.