This backpack size: 44 * 30 * 14 * cm (± 1cm), net weight: 985g, bearing about 15KG, backpack built-in computer compartment can accommodate about 15-inch laptop (computer width ≤ 26cm). Notebook mezzanine size: 35 * 26 * 3cm. Some 15-inch notebook computer frame may be larger, it may not let go. Macbook15 inches certainly can be put in.