I wish to contend that "skin out" is much more accurate than "pack wt". An extreme example would be "My shelter is strapped to the outside of my pack, since it's not inside my pack it doesn't count as pack wt." a gas canister counts as pack wt. but alcohol doesn't. Cameling up doesn't count as water wt. but carrying in a bottle the same ,or less amount of water, does count. if it's in your belly or in a bottle it's still wt. There's a lot of difference between 3 lb. boots and 1 lb trail runners. One person can say they are carrying an item, another say they are wearing it. Not to mention seasonal stuff, like winter base layer vs. summer base layer. Too easy to fudge stuff on trail wt.
So tell us all of what you're really carrying not just part of it.