For trips up to about a week (7-8 nights) I use a Murmur at ~8.5 ounces.
I generally plan on two internal bags.
The first is a eVent dry bag for my sleeping bag and sleeping cloths (long johns, down sweater, wool socks) and goes in the bottom. Pulled inside out, it doubles as a pillow when stuffed with the pack and rain gear.
The second is a dry bag for food and goes upright near the center. It is also a dry bag and doubles as a bear bag. Food is usually figured at a bit more than a pound per day(~1#2,) soo, for a week long trip I often take about 8 pounds. Food is my single heaviest item. It varries in composition...
My tarp is about 8'x10' and is a shaped tarp. I have also had it up as a short (~5') lean-to. Rolled tightly, it goes next to my food bag. My pot goes on top of the tarp. The spoon, stakes and lid slip down along my back (hooks first.)
I also bring a small rock sack or ditty bag for small stuff: 2-3 bandaids, ~5' of duct tape, water treatment, a pair of 2016 batteries, an eLight for any night hiking, 35' of bear line, 10yd of some fine spectra cloths line(30# fishing line,)a small notepad, pencil, lighter, pills, leatherman micra, etc. This packs below the tarp.
The pad is a custom torso length NightLite. It is about 53" long. This *just* fits into the pad pockets outside the pack. This doubles as a frame for carrying the pack. The ~2" thick padding makes a *very* good frame for loads up to about 30 pounds, but I don't carry that much.
The SVEA 123 & cup go into the left hand pocket along with the wind screen.
A 12oz PET bottle of fuel goes into the larger front pouch, along with my rain jacket, fleece, fishing rod & reel, a couple spools of leader, a small flybox and small point&shoot camera.
My right hand pocket *just* fits two .5 liter gatoraid bottles.
Total weight is between 16-23pounds, depending. If I expect to use a lean-to somewhere, I will add a neoair. I use the NightLite to level what I can, so, both go. Lean-to floors are *hard*.
I use a Miniposa for longer trips. Really, this just provides extra space for food, though. I have gone as long as three weeks out with the Miniposa and came back with a couple days of food. There was plenty of room in that pack. The longest with the Murmur was around two weeks at about 26# to start. It was full at the start.