A good friend of mine is a full time hunting guide in the rugged mountainous terrain of Northwest Montana. He recommended I get an Eberlestock pack back about 10 years ago. That pack after long hunting excursions, getting wet, thrown around, and overloaded for hauling game still looks and functions like new. Didn’t think I’d need a new pack! But wait....the F1 Mainframe pack and bat wings I just received is destined to be my absolute favorite! The frame is light and extremely comfortable. Get this, your pack stands upright when you place it on the ground, very convenient. The frame shelf is an absolute fantastic design feature! Having a shelf to place heavy loads on is great! Whether it be an elk hind quarter, whitetail cape or big bull sheds the shelf is a rock solid support and anchoring point. The bat wings are tough, and can hold all the gear I take into the field. Need to modify the pack...the wings zip on and off with ease, a true testament to the quality of the materials used making the frame and batwings. The multiple accessories and associated pack combinations make the frame and batwings an absolute must have!