1. The Kanken rainbow backpack is available in two styles, the Kanken Rainbow Mini backpack and the Kanken Rainbow Classic backpack. Both backpacks feature rainbow-colored shoulder straps and handles. A portion of each backpack's sales goes to a project created by Fjallraven's parent company, the Arctic Fox Foundation, which funds environmental projects. square backpack The Fjallraven Kanken square backpack is one of the most popular backpacks on the market today. Its lightweight frame and roomy interior make it a great choice for backpacking. The Swedish company has been producing backpacks since the 1960s and has a huge variety of colors and combinations. The Kanken was originally designed to help Swedish schoolchildren avoid back problems. It has since spread all over the world and is one of the company's best-known products. It's made of tough, water-resistant Vinylon F fabric and features a large opening and zip for easy access to your items.