Well then, if you are using at least 20 pounds of consumables total, and if that is 10 pounds per half-trip, then you will have a total load weight of at least 30 pounds. If you are young and strong and adapt to the altitude, then you will be fine with that. However, you may discover that you can reduce the base weight a lot. You just have to put your mind to it.
You would get a lot of good out of a cheap digital scale before you leave.
Let's assume that you find something like a down jacket to cover you for early mornings. I doubt that you will need very much during mid-day rest breaks. One fleece at the very most. You will have a rain jacket to be your wind layer, and it needs to be packed at the top of your pack anyway.
My standard load is 10 pounds of base weight, 10 pounds of consumables, and 10 pounds of camera gear. YMMV