About the same size as the BMF is the SpecOps THE Pack. Set up a little differently, but it wasn't designed around a hydration bladder, for better or worse. I've examined a couple of them, and tried them on, and I like how it feels- I'm saving all the quarters I don't feed junk food machines until I can get one of my own. <img src="/images/graemlins/smile.gif" alt="" />