Yeah, I agree with Mike C about the pack and start weighing things.
I think I would concentrate on the so called big three for now. I will assume you want to go solo for a weekend. Your list is very incomplete, but a good starter.
1) A GG G4 is a good choice for light weight. Large enough for a weekend for just about anything. I use a Miniposa, no longer offered. Lighter, and a bit smaller. Also, less durable. (I have patched it several times, now.) Along with that, goes a NightLite pad. This serves as a sleeping pad, sitpad, chair(back is propped against a tree and the rest is under your legs), it's waterproof and light at about 6oz. Get the full 3/4 inch version and cut it down, adding tape at the seams to hold it together. This is a good example of two systems working together. Your pack benefits from the additional support from a frame of the pad. The pad and backpack make a good pad and ground cloth for your sleeping system. (Both are pretty water proof with a garbage bag inside the pack.)
2) Your bag can go. Way too heavy for what it is. But, this will cost lots of dollars. Shoot for around 16-22oz...sort'a depends on the featur es and durability.
3) Your shelter, for a fully enclosed one, will weigh about 14-16oz. All you need is a good tarp with a piece of netting (another 4-5oz.) Not cuben, but not at a cuben price, either.
Just make sure to pick a small mound when setting up with your pole. For one or two nights, this is good enough except for 48 hours of pouring rain. Rolled up tightly, this also adds structure to the pack.
4) Pot, alky stove and spoon along with a small pocket knife will be quite light. About 8oz total.
5) First aid kits are pretty easy. An 8' piece of duct tape will do it.
I make this total at somewhere around 75oz or 4#11.
This is a good start, but, I will note that it also requires all new gear.