Three zippered compartments, two side pouches, and small detachable case. Back pouch is open to slide onto the handle of your rolling suitcase for hands free option. Convertible between a backpack, crossbody bag, or hand held. Comes from a smoke free home. Base measures 12 inches x 4 1/2 inches. Overall height of back, not including straps, 18 inches. At its widest, expands to 14 inches. The depth when fully packed is 9 to 10 inches.