This pack is perfect for running longer distances. Down here in the west Texas desert water is sparse! I had been using an old waist belt pack and could not stand the bounce when carrying too much water. Nor did I enjoy the feeling of being cut in half to stabilize the load.This pack loads evenly, cinches down tightly above the waist, and above the chest. I barely notice I have it on. No bounce. I love the side pockets at the waist. No more loosening and sliding, or removing a pack entirely to get at my music, sunblock, gels, or other essentials. It can hold a layer of clothes, and snacks too. You could probably fit even more water in another bladder on top of the first, if you had to. It is so light, when only half full, I will also use it for shorter distances. No more hand held bottles. And it looks really cool. Well worth the price.