Isn’t the bends the consequence of the oxygen tank and nitrogen in your blood; and if the air in your body starts at atmospheric pressure it should be fine (though no idea about the effects on the human body from such a sudden change)

Long trips on planes/trains/busses would be a lot more enjoyable.

Emergency supplies would be available at a moments notice including escape from the elements (camping/travel just became a breeze) .

Would you be able to free dive super deep taking each breath or a rest in the pocket dimmension?