I really don't get it. All I see here is people trying to figure out how to game the system - how to maximize the weight of stuff they take (put it in their pockets, put it in their personal item, etc), so that they can take more than the airline's weight limit.
But then you have to drag all that stuff, and there are time when you really do have to carry it. Why burden yourselves with so many things you don't absolutely have to have. Why not find a way to only take what you need?
I don't take the absolute minimum I can take. I have thought of it, believe me. Everything I take is picked to be able to dry overnight. It always does. I really only need one set of clothing. I could wash it out before bed and let it dry overnight. I've thought of sometime going to Europe with just the clothes on my back. Or maybe just one change, and alternate. No, I think I take a reasonable amount. In addition to what I wear, I take two more pair of washable slacks, several pair of walking shorts, four washable shirts, and two changes of underwear. I take a sweater to wear under my jacket on a cold day. In the summer I wear a light jacket on the plane; in colder months it's a down parka. That's all the clothes I take. I wear the only pair of shoes I take.
With three pair of slacks and five different shirts, I could make up fifteen outfits, but I rarely stay in one place for me to be seen once in each outfit, twice in a shirt. But really, who out there is keeping track? Or if they are, do I care?
Yes, I have to wash out underwear almost every night, 18 times in a 21 day trip, and shirts 16 times in a 21 day trip. One of the milestones of my trips is when I realize I have enough clean shirts, and then enough clean underwear to make it home without washing. But if I doubled what I take, I would only reduce the underwear nights by three and the shirt nights by five. It wouldn't make that much difference, and I would be carrying a lot more.
I only take one pair of shoes, and I wear them.
My personal item is a small laptop in a case, about 3½#.
So, what I take in my carryon bag weighs less than 10 pounds. My bag weighs a bit more than two pounds, so the total is around 12 pounds - not too much for my back.
I've been traveling this way now for over ten years, and I've never, ever wished I had brought something more.
Someday, if it ever happens that I can't carry that little amount on my back, I can get a 5# roller and still be under 8 kg.