The Norr''na Falketind Spring Steel 55L Backpack offers many of the great features on Norr''na's other packs, except this one has a much burlier SpringSteel carrying system built into it. The difference is a light steel internal frame that lends structure to the pack and makes it far more comfortable to carry heavy loads. It distributes weight between the pack's flexible hip-belt, shoulder straps, and back panel, which means your four-day trip just might feel more like a two-day trip to your shoulders and back.