Kånken Backpack - Flint GreyStraight backs are happy backs! Kanken was created in 1978 to help prevent back problems among Swedish school children and quickly became a common sight at preschools and nature schools throughout the country. Today, 35 years later, Knken has helped straighten millions of backs across the globe and has become one of Fjllrven's most beloved products. The material is hard wearing, lightweight Vinylon F fabric that is able to withstand dirt and wetness.