Add one for the external frame. My Kelty is actually lighter than internals of the same capacity I've looked at. Like others, I find I rarely use it these days, but when I do, I'm delighted to have it.

And like others, I used a lot of wool and loved it. Only reason I don't use it today is that I have this (fairly new) child bride and trophy wife who's allergic to wool. She can't backpack, but she's a delight on canoe trips, and I typically use much the same gear. In cold weather, it was not unusual to wear three layers of wool with a shell over in camp. Stuff was heavy though.

best, jcp