A well made vest made for any endurance event or race. Held all my gear to include rain jacket, headlamp, 5x energy goo, 3x sports bars, half liter water bottle, and plenty of front pockets for more. There are no large compartments with zippers or Velcro to secure items in aside from the 1 liter camelback pouch provided you remove the bladder. Main issue I had during my event was that the pack's straps would loosen resulting in it sagging to the rear of my back when running. After securing the excess slack into the retaining straps built in, the issue went away and I was able to get back into my normal rhythm. It's obvious the designers put a lot of thought of what endurance runners need into this pack. Great investment!