"13oz pack is generally too heavy to get most below 5 lbs. In any case, is it big enough to carry a weeks food? A bear can?"
I don't have an Arc Slim (2200ci plus mesh pocket) but based on my experience with a small Zero (1700ci) the Slim will fit a weeks food. Not sure on the Bear can though. The Slim is comparable in size to a GG Gorilla. A full size Arc Blast (3200ci plus mesh pocket) in 1.43 cuben with the specified deletions would only add 1.5 ounces, that would be a good option for a bear can.
"You have omitted several stakes . The solo needs 10 stakes. add another 1 oz."
Only six stakes are mandatory on the Solo, which is what I usually pitch it with. the additional points can be secured with rocks if desired.
"Despite what it is advertised at, the zpacks hood is made by goosefeet and mine weighs 1.6 oz."
Mine weighs exactly 1.2 ounces. Call it a 1.4oz average?
"No alcohol container, add 1oz"
Esbit, no container needed other than the ziplock listed.
"Wt of the first aid/repair looks low…0.9 oz?"
That's the actual weight of the items listed, it is my own SUL kit.
"No meds. Need at least 1oz of ibuprofen, loperamide, benadryl, etc."
Fair point, I listed minimal meds, but there is plenty of precedent for listing these as consumables.
"No food bag? = 1oz"
Food bag is listed
"No pack liner for down=1oz"
Arc slim is fully seam taped and has a dry bag style top. Also the Zpacks stuff sack is seam sealed and can be used to store the quilt, puffy layer and hood. And a poncho is listed. That's three layers of protection.
"Zip locks to organize all the little crap? 0.5 oz"
A single ziplock for the misc stuff and map – .17 ounces
"ziplocks to keep map dry? .3 oz"
See above
"No rain gear for legs, wont cut it in cooler weather. = +2 oz for cuben rainkirt."
My Solo Plus poncho reaches just below my knee.
"No arm insulation, really? add 2 oz for exlight jacket instead."
I hike in a long sleeved shirt, plus a windshirt is listed. I've never needed more arm insulation, even in 30 degree weather.
"ID?Cash?Credit card? in ziplock = 1oz
Drivers license, a couple hundreds and a couple twenties weighs .28 ounces. Add a small rubber band and put them in the misc. ziplock.
"Toilet paper in ziplock? TP is consumeable, but ziplock isnt = 0.3 oz"
Again, in the misc. ziplock. There is plenty of room for 2-3 compact rolls.
"1 gal Garbage ziplock = 0.5 oz"
Use first empty food bag or ziplock
"Car key?"
On a thru hike? I hide mine on shorter trips, that's less risky than dropping it somewhere in the backcountry.
"CAmera/phone = 4 oz"
Nice, but optional, this is SUL after all.
You've added .65 ounces, and that's if I up the weight on the down hood. I think my point is safe…