Dimensions: 18" x 13" x 7.5". Accomodates 100 oz hydration reservoir (not included). Heavy duty lockable YKK zippers. Metal grommet at bottom of pack for drainage. Urethane-coated mesh internal pockets. Individual medical gear compartments. Internal tri-fold flap. Items shown in images are not included with backpack. 1000D nylon construction. Color: OD Green. Bulk packed.