The main compartment is 20H X 12W X 7.5D, with 3 internal mesh pockets. The largest mesh pocket measures 12H X 12W, the other two zippered mesh pockets are 10H X 12W and 9H X 12W. With lockable metal zippers.The top front zippered compartment 13H X 11.5W X 3D with several internal pockets to organize your gear. With lockable metal zippers.The top outside vertically zippered expandable pocket measures 12.5H X 11.5W with six rows of MOLLE webbing and loop fastener patch area for name tape or patch.The bottom front zippered compartment 12W X 5.5H X 2.75 with several mesh pockets. Compartment has two rows of MOLLE webbing.Side zippered pockets 9H X 5W X 2D on each side of the backpack with MOLLE webbing.4 each side compression straps with quick connect buckles.Adjustable padded shoulder straps and a sternum strap with quick connect buckles.Thickly padded back side has a large zippered compartment 19H X 12W with hang tabs for a hydration bladder and drink tube pass throughs.A padded waist strap (removable) with two zippered pockets 6W X 4.25H. Waist strap adjustable out to 57L.Two side and one top mounted heavy duty carry handle straps. 5 metal grommets for drain holes on the bottom of the compartments and pockets.Dimensions: 20H X 12W X 10.5DWeight: 59.0 oz.