Another thought that may or may not strike some creative juices on your end ...
I've been doing some research into the gear that soldiers, such as in the civil war, the War for independence, the spanish am war, etc carried that enabled them to march such long distances and still be an effective fighting force when they arrived.
They had a few really good ideas about traveling light ..
The Haversack was loaded with about 3 lbs of rations, cook kit, toothbrush, and other personal items for a total of about 6 to 7 lbs.
The rucksack with poncho, tent, wool blanket, extra shoes, and extra clothes came in at around 25 lbs.
The Canteen carried about 3 pints of water and weighed about 4.5 lbs full.
If we updated the concept .... 2 lbs of rations removed from pack weight, 1 lb of personal gear with cook kit and ultralight Haversack (AM mini kit for Water).
Great kilt removed from pack weight, 3.5 oz tubes, 6 oz emergency bivy?, 1 oz cuben rucksack, 4 oz cuben poncho w/ line and stakes, 1 lb for High loft pullover, hat, gloves, and socks.
That's a bit over 2 and a half pounds. Three and a half if you replace the Em Bivy with a 16 oz down blanket.
If the Blanket is like a Jacks-r-Better with a head hole, so it can be used as a down poncho liner, then you can cut the High Loft pullover, so you're back down to the sub 3 lb range again.
Just thinking out loud