Compact design with 4 compartment configuration.One main compartment with large pocket ideal for hydration bladder or laptop computer. Front compartment with a multitude of accessory pockets. Secondary compartment with dual mesh pockets. Padded back panel compartment with pocket that is suitable for a laptop computer,hydration bladder or other items that require quick access. Modular attachment points on front and two sides. Fully padded ventilated back panel, adjustable & padded shoulder straps with smart phone case, heavy duty zippers with pull cords and side cinch straps,molded top carry handle and hanging hook. Waist belt with dual zippered pockets. Size: 19 1/2" x 12" x 12"