K-Cliffs Green Polyester School Backpack/ Outdoor Backpack/ Hiking Backpack with Reflective Strip Main dual zippered compartment: 17" H x 12" W x 5.5" D, with interior pockets Second dual zippered compartment: 9.5" H x 9.5" W x 1.5" D Front dual zippered compartment: 9.5" H x 9.5" W (interior) with multiple pockets plus pen holders. Front zippered panel: 9.5" H x 9.5" W (interior); 2 mesh water bottle pockets on sides Adjustable padded shoulder straps and Reflective strip on the front compartment.