I own both the ZPacks Exo and the ZPacks Arc Blast. Both backpacks use the same bag on a different frame.
This year I hiked the JMT and SHR with the ZPacks Exo. The year before I hiked the JMT with the Osprey Exos 58. Here is a BPL link that describes my experience ZPacks Exo on JMT with up to 39 lbs
So far I have not taken the ZPacks Arc Blast on long trips -- only on 20 miler weekends. On the last 20 mile trip my wife carried it instead of her Osprey Exos 58 and she was very happy with it. She didn't like the Zpacks Exo in the past and kept her Osprey Exos 58 -- mainly for the mesh panel. Now that the ZPacks Arc Blast is offering such a mesh panel she is switching to save 1.5 lbs on her backpack. Since we are carrying Bearikade Expeditions in the Sierra it is important to us that they fit into our backpacks. Although the ZPacks Arc Blast uses the same bag as the ZPacks Exo and the bear canister fits without problems into the Exo we had problems with the Arc Blast due to the curvature of the frame. We had a hard time sliding the canister past the cross bar. Thus we returned the first Arc Blast and asked for a special order with a bag that has a wider diameter (by 0.5 inch). That solved the issue for us and we can now carry the Bearikade Expedition in the Arc Blast without problems.
The total volume of the Arc Blast is stated as 52 l (3200 ci) on the ZPacks website broken out as follwows: Main body (2,400 ci) + Mesh center pocket (550 ci) + Side pockets (250 ci)
Total volume- 3,200 Cubic Inches / 52 Liters
I added two hip pockets and two shoulder pouches to my ZPacks Exo and had enough space to carry everything for our JMT trip.
Looking at your gear list, I would think that it all fits. Here is a rough description of my gear and where I put it -- following your list.
Skyscape Trekker w/CF poles (that's the plan as of now, anyway) -- SMD Haven - main body
FF Swift/Neo XTherm -- WM SummerLite/Neo XLite - main body
Jetboil Sol Ti, fuel, Ti mug, Ti spoon - Caldera Keg-F Stove System (incl. stove, pot, mug, cup, Ti spoon, sparker) + 8 oz fuel botte - left side pocket
Platy 1L (x 2), 32 oz. Gatorade bottle -- 32 oz Snapple botte (2x) - one in each shoulder pouch
Steri-Pen Adventure Opti - SteriPen Freedom - left hip pocket
TP/Trowel/Wash kit (5 oz total) - right side pocket
Headlamp (H51) - Zebra H51 - right hip pocket
2 each Bic minis - sparker - in Caldera Caddy - left side pocket
Map/Compass/GPS -- map in use in pants pocket -- other maps - mesh center pocket -- compass right hip pocket -- GPS on left shoulder belt
First aid/repair kits (4 oz total) - right hip pocket
50' Spectra cord -- 50' Kelty triptease -center mesh pocket
Multitool (PS4 - 2 oz) -- Leatherman Style - on lanyard
Sunglasses/Canon S100 w/case extra batts & mem card -- Canon Powershot SX 150 - left hip pocket
Whiskey (750ml in Platy) -- N/A
Food @ ~1.75 lbs day -- Bearikade Expedition (900ci)full with food for 10 days - main body
Clothes - 1 ea. socks and underwear, Terramar bottom, Smart Wool top, MH Canyon shirt, Houdini, Patagonia down jacket, rain gear, hyperlite gloves, MH beanie, bandana -- rain gear, gloves - mesh center pocket -- socks, underwear, down jacket, down beanie, long underwear -- main body.
In addition to that I carry Tenkara poles in the right side pocket and some fishing gear (box with flies, etc.) in the center mesh pocket.
I hope this helps,