779 is the commercial equivalent of 600 film from Polaroid. It is able to be used with all 600 series cameras and, with some modifications, older SX-70 cameras for which film is either unavailable or prohibitively expensive. Using one of the methods available on various websites to stop down the lens and fit the pack in to the camera, you'll be able to get good looking shots although manipulation is not as possible with 779.
Overall, a great value for quick, easy, good looking shots.