The rugged, full-sized Geo Pack backpack is constructed of tough nylon cloth. Features: 8 stage height adjuster at the back（15" to about 21" It's adjustable）, internal aluminum frame, adjustable padded hip belt, YKK Zipper, and YKK Buckle, a zippered bottom compartment big enough to hold extra gear, and heavy-duty side pockets for storing radios or water bottles. Color: Grey Measures: 29.9 x 13 x 10.2 inches (76 x 33 x 26 cm)