This bag measures 9" tall x 11 1/2" wide x 4 1/2" deep. This bag can be worn over your shoulder or as a back pack simply by unzipping the center of the adjustable strap. The front of the bag has a roomy outside pocket with a fun wavy zip opening. The opening to the main compartment faces your body so it is very secure. This main compartment has a very large zip around opening with an outside pocket that also faces your body. This large opening enables you to easily see everything in the your bag. The inside features a key clip and another zip pocket.