Join Date: Mar 2011
Hammock: WBBB Dbl 1.1
Tarp: MacCat Deluxe Sil
Insulation: AHE Jarbridge
Suspension: AHE Whoopies/biner
I agree with all of this.......
Join Date: Jan 2012
Location: Northern South Carolina
Hammock: DIY, Miskito
Tarp: HH Diamond & Assym
Insulation: UGQ & WL SS
Suspension: UCR's & Whoopies
I like your idea, seems very logical. I know it would add weight but what do you think about sewing up a bag/slip cover for them? It could have an opening for access to the footbox. Maybe sil ripstop on the bottom and and regular ripstop on the top. Seems like it would for bottom quilts as well. Modular quilt system.
Join Date: Jul 2011
Location: Jersey Shore, NJ
Hammock: BIAS Hiker Lite
Tarp: HG Winter Palace
The layering system seems logical to me. However, the drawback will always be additional weight. In deep winter weather, I might not even care about weight though - I just want to stay warm.
If I were to layer my topquilts, I would probably go synthetic inside, down outside. That would avoid compression of the down.
Join Date: Sep 2011
Location: Tbilisi, Georgia
Hammock: WBBB XLC 1.7
Tarp: HG cf WinterPalace
Insulation: WB yeti
I've got a sleeping bag setup along the same logic. Got the idea from reading about how Swedish military deals with the colds of winter up north - a double sleeping bag system (I think made by Carinthia), when combined rated to an extreme of -40 c or so. Individually, hte bags are summer and 3-season rated respectively. So it's definitely a viable idea with lots of versatility, the trick is that one of the bags should be larger and roomier, to minimise the compression loss. I'm defiitely willing to take the weight penalty, bags rated similarly will weigh that much anyway (well, almost). And as you point out, it saves a bunch of money as well.
I like the idea floated about a synthetic outer actually, makes a lot of sense to me. What's a roomy synthetic summer-rated bag that I could look into?
Join Date: Dec 2010
Hammock: BIAS WW
Tarp: AHE Toxaway
Insulation: JRB SS & HG Clone
Suspension: Whoopies & Straps
Well, if you can get even a thin layer of lofted down, that doesn't get compressed, on the inside layer, then theoretically the wicking and drying qualities of a high quality synthetic, could come into play.
It also might make for a dandy way to turn summer and 3 season insulation into serious cold weather gear.
Dry Down, mentioned in a couple other threads, might hold an important key toward this.
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I stack TQs and UQs all the time. I have a couple of 0F setups, but sometimes it gets well below 0F here in the Colorado mountains...just not often enough to actually make a -20F hammock kit (and no one makes one for sale b/c there's not a big enough market). So I just stack some extra stuff on there. Last time I used a 0F Yeti, 30F No Sniveler on top, and a PeaPod layered around all of it. (IIRC)
The military has been using overbags for a long time...same concept. Wiggys makes a good kit, though it's a bit heavy for lightweight backpacking.
Re: the drying, it doesn't actually "dry" the inner layer but it does keep so much moisture from building up in the lower layer in the first place. Basically, your warm body is producing moisture, which moves up towards the cool outer layer of your TQ. At some point, that moisture reaches the dewpoint and condenses into water. If that point is inside your TQ, the water stays there. By having two layers of TQ, you're (hopefully) pushing that dewpoint into the top layer...and it's easier to dry one thinner layer than a big thick TQ.
There have been some commercial attempts to create a hybrid down/synthetic sleeping bag based on this principle, but none have been very successful. Part of it is trying to capitalize on the "hype of technology," b/c the concept is sound but the execution is flawed. Generally, synthetic insulation is heavy enough to compress the down layer to the point that any gains in maintaining loft by removing moisture are lost by compressing the down in the first place.
FWIW, the original JRB winter kit (in ~2005 or so) had a NS+Nest stacked as UQs and an Old Rag Mountain as a TQ.
So the principle works, and it's a very flexible and cost-effective approach for people who don't need a dedicated cold-weather kit...or just don't want to spend the money on one.
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I will bring my Golite Ultra along to supplement my Dreamwalker bag. Ratings don't stack as a result, but never been cold down to the teens. I'd say it truly adds 10 degrees temp rating to the 20 degree rated DW bag - as opposed to the very questionable liners that supposedly add 10 degrees.
I have the JRB liner which is very warm for what it is and about the same weight as the Golite, but the Ultra packs down a lot better, besides being warmer.