Explorer Military Tactical Backpack Army Assault Pack Molle Bug Out Bag Backpacks Rucksack Day Packmen Women Unisex Outdoor Large Military Tactical Backpack Camping Hiking Bag Trekking Sport Rucksack Polyester 600D Tag Measures 17x9x11 inches but is a bit bigger. Larger Main compartment with a full mesh pocket and smaller zippered internal compartent. Padded along the back with a velcroed compartment for a hydration bladder, not included. Large secondary compartment with internal smaller mesh pockets. Two additional rear compartments with internal pouches and molle gear attchements.