I have and like very much my Eberlestock X2. Almost purpose built zipper pockets for spotting scope and tripod, aluminum frame, great fit (though I’m 5’9”, it likely wouldn’t fit someone with a longer torso). It’s large enough, but it is not cumbersome when moving through brush. It is also capable of packing out an elk quarter, which is a big deal to me. No more wasted trips back to the truck to get the larger pack frame.