Eberlestock Mainframe Freighter Frame Pack - The F1 Mainframe represents what is arguably the greatest innovation in modern pack making, the holy grail of a great modular pack system. But unlike any other pack system, with this load bearing workhorse as a base, you can build a true ultra-light pack simply by adding one of our J2DB Dry Bags. The F1 is one of the primary base-platforms for the EMOD -- the Eberlestock Modular System, and it works with an ever-growing number of complimentary accessories. Add components of your choice, and the Mainframe can function as a freight pack, day pack, or all-around utility pack. For hunting, it transforms to a meat hauler within seconds Intex ll aluminum frame. Zippered attachment points compatible with our duffels, drybags, and more. Full MOLLE webbing matrix covers main panel to attach scabbards, pouches, etc. Three built in horizontal compression straps for securing your gear. Adjustable ladder harness system. Makes customizing the fit quick and easy Lifetime manufacturers warranty.