This pack has a 8.5" x 5.5" x 2" main pocket with top zipper entry, open top mesh panels on the exterior. Also two 5.75" x 4" x 1.75" pockets with top entry zippers with each of these pockets having a 3.5" x 4" x 1" zipper entry piggyback pocket. Zipper entry elastic edged pocket - for water bottles, etc.. All pockets are separated from your body by a 26" x 6" pad for added comfort. Adjustable 2" nylon web belt with a heavy-duty buckle that fits up to a 60" waist.