Skaha Plus – 12.26 oz
Arc AT Med/Long – 8.78 oz
The Skaha has 2oz extra features to it between the overfill and the pocket. I'm okay with the weight though because I intend to use it in the winter and to boost other bags in the future. The pocket is very very nice IMO. I also have the cocoon hoody if I really need to shave a couple oz at the expense of warmth. The Skaha Plus how I ordered it is *really* warm. Blows my cocoon and Micropuffs out of the water. You could drop a little weight with lighter cord and cordlocks too but I haven't got around to it yet.
The length of the 60" arc AT is maybe 3-4" below my armpits when wearing the skaha plus but it creeps down a little futher in the night sometimes. I'm glad I didn't get a standard medium at 5'11". If I get an arc edge in the future I would make sure it's long enough. It's harder to "cheat" on length with a quilt vs a std bag.
If I wanted the lightest setup I would have gotten an arc edge with no jacket. I wanted a very versatile setup though so the sub 9oz arc AT in my quiver is very worth it. I don't know how many times I've found the bag/jacket combo to be much more enjoyable than "just" an ultralight bag.