Rugged nylon construction. Heavy duty non-rusting zippers. Hydration system adaptable, “D” ring attachments, molded back panel, extra wide detachable adjustable shoulder harness, adjustable waist belt, straps for adding universal or Alice clip pouches. Equipped with a removable medical patch with hook-n-loop backing which can be replaced with your blood type or unit I.D. patch. Measures 10"L x10"W x18"H. Hydration compatible.