How much does this weigh and is it very compactable?
A little over one pound and very compactable in three ways- a stuff bag Kelty supplied, a nylon super stuffer that the bag comes in, or, you can buy another compacting bag and get it even smaller!
Caveat. Below 40 degrees go for the regular Kelty bag.
I bought this bag about a year and a half ago. I love it. I don't know the exact weight of the bag, but it's very light (seems like almost nothing when in my backpack). It is very compactable. Being "down", you can roll it up nice and tight and squeeze it in tight places. I hope this helps.