Mike: That's encouraging news. To make sure I understand you correctly, are you saying that, when using your eVent bivy in damp conditions, you lose only a little down loft? Also, I've tried out the ID Micro Bivy, and returned it after reading here about the benefits of the Overbag. However, I really liked how the Micro Bivy had shock cord on both the top and bottom of the opening. I noticed the Overbag only has a drawcord on the bottom. Do you find that drafts can enter the hood, or does it cinch down when the lower drawstring is pulled taught? Or, is there a place in the hood where a drawstring might be threaded through?
Re: hiking in clouds, last winter I hiked Oregon's Silver Falls trail in heavy fog, 48 deg. temps. This is in the foothills of the Cascades, so normally very rainy in winter (as opposed to snowy). This trail is 7.5 miles and passes 10 waterfalls, most higher than 100 feet. This is all in a narrow, steep valley which traps the waterfall vapor even on warm, sunny days. And, the trail meanders behind four of the waterfalls.
This was when I experienced being drier in my eVent jacket than without it. In the middle of the hike I had unzipped my eVent jacket thinking I wouldn't need it anymore as I had adequately warmed up, and I began to feel clammy in about five minutes. Zipping it back up I was dry again in five more minutes
This past week I did a local hike in rain and humidity. In the uphill stretch, I indeed got a bit clammy. The fabric started to feel a little damp on the inside. But 10-15 minutes into my descent I noticed that the inside of the fabric felt completely dry, and my skin no longer felt clammy. I think this is one of the real advantages of an eVent jacket vs a poncho or less breathable jacket; the ability to continue to dry out once exertion levels have been reduced.
But I do realize that, despite whatever resistance eVent offers to moisture buildup, I'm still ultimately taking more of a risk with down than synthetic. I believe Ryan Jordan mentioned the updated Cocoon quilt will be warmer than the 180 and still only be 23 oz. I suppose that's not that big a weight gain, and the larger backpack will allow more versatility. Sigh…
Re: knee-length jackets, I would loooooove to see a knee-length eVent jacket on the market. You don't know of any NZ manufacturers that make such a garment, do you?
Roger: This is great advice: "It's a case where having the right gear for the conditions is a bit more important than normal – and a bit more important than blindly following some set of UL rules," and its nice to hear from a BPL Staff member, since so much of this website is devoted to pushing to the extreme in relatively dry conditions (though there have been some great articles recently about wet weather hiking).