Best Very Warm (<0) Compressible Synthetic Sleeping Bag

How is the cut of that bag Craig?

I'm average height and build and if is a good fit. My one quibble with them is I'm not a huge fan of the dual zips. I prefer one full length zip so I can use the bag like a quilt if the mood strikes. But this is a minor thing. The bag was a really good deal otherwise. It's not as warm as my western mountaineering Apache 15. But it is very true to the rating and EN numbers.

Hi Austin

Thought I would jump in with my penny rather than 2 cents worth.
I have used sleeping bags all my life in what I consider wet and cold conditions and I must agree that down fill, if kept dry, cannot be beaten.

My problem is I like to go on expedition kayak trips. So I have to assume things will get wet. Plan for it in fact.
I usually go to Algonquin park as soon as the ice melts. Last year I went to Opeongo lake in the north east arm and made my base camp there while I paddled to explore the region and relax. It got cold very fast at night. My down unfortunately got wet. I froze for 2 nights until I finally got it to dry. Had it been raining I would have froze for 4 nights. I did have it stored in a dry sac but stuff happens.
Because of this I ordered the snow leopard.
After researching all that EN rating stuff I decided to look into the company that makes the insulating material for that bag. From their web site:

"The North Face Snow Leopard 0°F sleeping bag is prime for mountaineering and cold-weather backpacking, trapping heat inside where you want it. A solid layer of Climashield Apex is placed over the core of the body to reflect radiant heat while Climashield Prism wraps all around, working exceptionally well when compressed."

They have it as a feature here: http://www.climashield.com/outdoorspotlight
You can also look at the material used and get specs that they will e-mail to you via a PFD file.

I will be compressing this bag to save space as I like to go in luxury and usually make sure I'm comfortable (I'm getting old and soft lol). So a compression bag of about 15L is needed from what I could deduce. It will take more room but like alot of people that have replied to you here already stated "you can't have everything".

If there is even a chance your bag may get wet then go with Synthetic. The rule usually is if it can happen, it eventually will.
From experience a down bag is nicer and compacts much smaller, but unless you plan on having a guarrantied water tight storage bag for it (and I thought I did), go with Synthetic.

I can't confirm how good this bag is yet but I'm pretty sure it will beat my old bag should it get wet, plus Synthetic dries much faster. I prefer to be safe as I already went through the sorry part lol.

Hope this helps :)