How did we run long before Nathan?
I love this pack. I was introduced to Nathan while crewing for Karl Meltzer in his speed record attempt of the Appalachian Trail. I borrowed one of his packs to run with him on a few 20-mile sections and was hooked. I just recently got this vest and have been so psyched with it. It fits perfectly with the strap adjustments. I've never experienced any chaffing, discomfort, ride or slipping. I love the thoughtful design of the front pockets - room for a cell phone or camera in a zip pocket, with bungee-secured mesh pockets for gels, a flask or bars. The back pocket is a nice size for extra fuel, a light jacket, and keys. Plus there's room in the main compartment for an extra shirt or socks if you're going out for a long time and want to be prepared. The Nathan reservoirs are great. The material is supple and strong, so you don't have to worry about damaging it when yanking it around or cleaning it. They're well marked liters/ounces. They open all the way across the top for easy cleaning, and close securely with a fold and a barette-like sliding clasp. I love the hook inside the pack that keeps the reservoir from slouching down in the pack as you empty its contents. You can clean the reservoirs really well too, so you don't have to taste berry nuun in your water for weeks after you decide you need a little flavor in your hydration. Even with everything you need for a long run, the pack is light and fits well. I highly recommend it!