The new F1 Mainframe is the next innovation in minimalist hunting packs. This system was made to serve any situation and any environment. With over 100 possible combinations, you can always make sure that you have the right gear, right when you need it. Combine it with one of our duffels, dry bags, or zip-on packs to build the style of pack that you need. The modular system works with over 15 Eberlestock add-on accessories the Mainframe can function as a freight pack or a day pack, and transform to a meat hauler within seconds.