Eberlestock Mainframe Pack The F1 Mainframe feature Eberlestock Intex II frame and has endless posibilities to configure the pack for your needs. Use the frame by itself when packing out game or add a number of different option via zippers, buckles or MOLLE/PALS webbing The Mainframe also features 3 built in compression straps and like most Eberlestock pack and adjustable ladder harness. Material: NT7 waterproof fabric / water resistant construction Color: Hide-Open Timber Veil