Double internal compartment, one large & one with plastic/foam stiffener Zipper closure for main compartment Front has two external pockets, one smaller one with Velcro closure and the other with zipper closure that also has a Velcro compartment in it, both secured by lock fasteners Two extra fastener buckles near bottom front Along the sides and front of pack are points for attaching optional pouches...plus lock-fasteners near the top and bottom of sides for security Top of pack features carrying handle and looped lock fastener straps Shoulder straps have wide and narrow attachment points, with a center lock fastener just below chest Nylon belt-strap with lock-fasteners to go around waist 2 drain eyelets near bottom of pack Back has a large compartment slit with translucent 2 x 3 in.