Our four point 4-S sternum strap is a dynamic tension system that divides pressure evenly over the chest, as the sternum strap is attached by four points instead of two. It has one static side and one elastic, with attachment points spread out wide across the chest for all four straps, meaning it can be adjusted to width as well. All in all, this means the pack will be pulled close to the body, but without tension or pressure created by one single sternum strap. The user will feel like he or she is wearing a vest rather than a backpack.