For many years I have used my North Face cat's meow and it has served me well. But the time has come to find its replacement.
I remembered a friend of mine in college bought a REI sub Kilo which seemed like an excellent bag. (20 degrees, very light and packed down to the size of a large grapefruit)Unfortunately it appears that this bag has been discontinued.

So my question is what is the lightest 20 degree bag that you know of.

Thank you