Warm and Super Light
So this thing is light. It packs down not much smaller than the stuff sack it comes with, but if you're using a 50L+ backpack, it fits nicely at the bottom of your pack, laying horizontally. Now on to the warmth factor: It's very. I sleep cold and was almost sweating in 15 degree cold and wind. I had to sleep with this thing unzipped. When zipped all the way up, you can cinch everything down to where only your mouth is exposed so this thing could withstand cold well below 0 if needed. The Euro Rating System has ranked this bag at -27 to keep you alive, so a 0 rating is ultra conservative.
The baffling, workmanship, and down are all top quality. I've used the Grizzly GWS 0 degree Western Mountaineering bag and I prefer the Phantom bc it's just as warm and has a much better hood. The WM hoods are bush.
Get this bag! It will keep you hot when it is Sub Zero and will last you at least 7 seasons with very regular usage. Lastly, it doesn't leak down like everyone says. Mine has been awesome! And YES, there is a zipper pull inside the bag for you to open and close with ease. This is the best 0 Degree bag out there.