I strongly suggest reading The Pacific Crest Trail Hiker's Handbook by Ray Jardine, or the latest version, I read it in the 1990s. After hauling typical mega-weight on the AT, he thru-hiked the PCT with a pack under 10 lbs not counting food and water. Rocket payload engineer; Less payload means less rocket and fuel to lift it; For backpacking it means can travel faster and farther in lighter shoes, so less food required between resupply. The big three are shelter (he used only a tarp), sleeping bag (minimal quilt), and pack itself (one compartment, light fabric, only shoulder straps). I didn't go ultralight like him, but split the difference, closer to 20 lbs; 3000 in^3 (50L) pack with stays and hip belt, I think about 2.5 lbs, good bag (I sleep cold), and 2 person square dome tent as it was 5 lbs versus 4 lbs for a single and that extra space was mighty nice in extended rain with no vestibules, and fully enclosed so no mosquitos buzzing me as I sleep. Newer square tipis using hiking poles are nice, but not freestanding so need to use more stakes and problematic on solid rock.

Super good book, I've applied to my bike travels.