Feathered Friends Draft Collar

I bought the 10F Lark for this very reason. I’ve had a passive collar before and did not like it at all, especially for a 20F bag. I think you would be wise to get the 10F version or choose a different bag manufacturer.

I should rephrase part of this question to add some detail. I’m confident in the design just by Feathered Friends reputation. If the design needed a non-passive draft collar it would have one. I am looking to save some weight and especially some pack volume from my 15 degree WM bag. This looks like it would do the trick and still be fine. My biggest concern is in extremely cold weather when I pair it with a quilt and where down clothing to bed to stretch it to complete winter conditions if I will dramatically miss the non-passive draft collar. Does anyone have experience combining bags in winter when non of the bags have draft collars that can really seal?

Zack, what temperatures are we talking about when you say extremely cold? I’m almost certain the passive collar will be an issue for you in colder weather. An overquilt will help some, but it is still not addressing the primary issue surrounding the passive collar. Heat will escape and cold air will continue to be reintroduced. I don’t think a down jacket would rectify the issue either. I can see a down jacket working as a draft collar in a quilt, but not in a sleeping bag.

You will likely get more feedback in the Winter hiking BPL forum.

Not extreme cold, but on a recent snowshoe trip I was using an FF Osprey 30 UL (now Swallow UL) w/ a 50 degree Apex quilt over the top- temps fell to around 10, I couldn’t haven been cozier (I need to add I was “cowboy” camping with a bivy, so I’m sure that added some measure of additional comfort).

Good feedback guys! This weekend in the Adirondacks is reached -17. I was using a 15 degree WM Badger, a MLD 50 degree quilt and an XTherm. Sleeping in down socks and pants I was warm (I was surprised because this was much colder than I had ever tested before) The Badger has a serious draft collar but it’s also almost 8 ounces heavier and more importantly takes up almost twice the space as a FF Swift UL. Normal cold for me would be closer to 0 to -5 maybe. Like I said, -17 is uncommon for me.