OK, well, I guess the reason that I'm looking at Winter synthetic bags is that I want to get out there this weekend and I don't have my sleep system together. My original plan for the winter was to layer a Patagonia DAS, Cocoon Pants, Arc-X, and Arc-Cocoon. Well, the Cocoon Pants and Arc-Cocoon are MIA so I need to come up with something else. I have the other components. Do you think layering a DAS, fleece pants, EMS Velocity (30 degree rated primaloft bag/comfortable 40), and Arc-X on the outside would work? The Arc-X won't fit inside it. I'm not happy about putting the down on the outside but there isn't anyway around it as I see. It would be squished on the inside. If I could squeeze it on the inside, I definitely couldn't wear the DAS. How long till the Arc-X fails from condensation?