Rucksack is what it is, the ole square backpack. One of the classic favorite due to its simple straightforward design. For unknown reason, the most desired are those rugged looking with vulcanized patches in the body surface. Made from discarded truck inner tube, the interior is lined with waterproof fabric with compartments for 15″ laptop and pockets for documents. An office pocket fits two smartphones and a pen. A sizeable zipped pocket occupies the top which also serves as the flap cover. The back is lined with rubber mesh which is intended to hold a jacket or a coat.