Straight backs are happy backs! | Today, 35 years later, Knken has straightened millions of backs across the globe and has become one of Fjllrven's most beloved products. This classic backpack is equally suited to journeys to and from school or work, as it is to trekking and travelling. The material is hard-wearing, lightweight Vinylon F fabric that is able to withstand dirt and wetness.The spacious main compartment has a large opening with a zip, which makes it easy to pack and unpack. It has two flat side pockets and a zipped pocket on the front, perfect for those bits and bobs that you want to keep close at hand.