I have been looking for a backpack to carry my scope and gear in. Has anyone tried the Tamrac Expedition 5, 7 or 8 series? I see that the inside dimension of each is 13.5", 16" or 20.5". Most spotting scopes are 13" to 20" long. What do you use to carry your scope, eyepieces, camera and accessories all day over hill and dale? Saying your partner is not what I'm looking for. I' the guy that will be carrying hers...