The Elberstock Halftrack is a great three day pack. Its total volume is 2,150 c.i. and its dimensions are 24"h x 11"w x 7"d. It contains two levels of different sized tuck-pockets lining its interior, MOLLE-style Padlock webbing racks inside and out, and a fold-down shelf that can be used to divide the main compartment into upper and lower sections. It will carry two 3-liter hydration kits when mounted in side pockets, or two 2-liter bladders in side-sleeves. This will allow you to keep the main side pockets free for other gear. The waist belt features a 5 x 2 Padlock matrix on each side. This pack also has a Gossamer polycarbonate frame, is well ventilated, and is comfortably padded with a deep-cut airmesh foam. A radio rack with large antenna portals is fitted to the back wall of the upper chamber.