Results 1 to 9 of 9
  1. #1
    Senior Member
    Join Date
    Sep 2010
    Location
    harrisburg, pa
    Hammock
    Grand Trunk Nano 7 or Byer Moskito
    Tarp
    zpacks cuben
    Insulation
    Down bag cocoon
    Suspension
    1" straps/whoopies
    Posts
    114

    Vapor barrier solution

    I have perfected my ultralight, minimalist solution to cold weather hanging. Low cost. Minimal gear. Ultralight weight. No fiddling around with top quilts and bottom quilts. No sleeping pad inside the hammock.
    Here is the list
    Grand Trunk Nano 7
    Whoopies suspension, straps with marlin spike & dead stick used for toggle
    Hammock pulled through inside of down bag with zipper in footbox. I use a Kelty Lightyear, which has a little zipper in footbox.
    Space blanket mylar turned into a mummy bag shape used as vapor barrier liner inside of sleeping bag. This mylar mummy bag came shaped as the mummy bag with the seams taped up nice and strong.

    Here is a link to the mylar mummy vapor barrier. Many sellers sell these on amazon and other sites as emergency sleeping bags. http://www.amazon.com/gp/product/B001MGS67A

    The mylar mummy bag vapor barrier weighs 3.9 ounces. In the ultralight world, that's a lot of weight. But, a down bag can gain, on average, a pound of weight per day on the trail from insensible perspiration that gets trapped in it as you sleep, and you can rarely dry a bag out on the trail properly. So the 3.9 ounce weight penalty goes away on the second day of the hike, and turns into a 12 ounce savings. On the third day, you enjoy a 28 ounce weight savings. Fourth day, 44 ounces. This is big weight savings on a multiple day hike. Plus, you sleep warmer -- maybe 10 to 20 degrees according to what you read. Keep the tarp rigged to block wind, and you have a very toasty, inexpensive, ultralight setup without all the fiddling around with top quilts and bottom quilts, etc.

    This video shows the hammock-through-back setup, but doesn't show the mylar vapor barrier. http://www.youtube.com/watch?v=4C9hZYe4dno

  2. #2
    Senior Member Rolloff's Avatar
    Join Date
    Dec 2010
    Location
    Leveland
    Hammock
    BIAS WW
    Tarp
    AHE Toxaway
    Insulation
    JRB SS HG Clone
    Suspension
    Whoopies Straps
    Posts
    1,195
    That is pretty much how I thought a VB should work.

    Don't forget to figure in the loss of down's effectiveness as an insulator as it puts on "weight" too. Gets heavier, you get colder. You wear more cloths, upsets the VB and you end up soaked. This way at least most of the moisture still remains inside the VB, whether it's on the inside of the liner or in your cloths. Still better than getting it into the down.

    Thanks for sharing.
    You got your cold dog soup and rainbow pie
    It's all it takes to get me by
    Fool my belly to the day I die
    With cold dog soup and rainbow pie

  3. #3
    Senior Member G.L.P.'s Avatar
    Join Date
    Mar 2009
    Location
    Schuylkill Co. PA
    Hammock
    DIY,WBBB,DutchBridge
    Tarp
    Cuben,Superfly
    Insulation
    Quilts :P
    Suspension
    Dutchware
    Posts
    5,107
    have you tested this in cold weather yet?
    as for fiddling with UQ's and TQ's i never had to fiddle with my TQ...
    now UQ's yeah sometimes you got to adjust them but not all the time

    but i would like to hear how this worked in cold weather
    It puts the Underquilt on it's hammock ... It does this whenever it gets cold

  4. #4
    BillyBob58's Avatar
    Join Date
    Jan 2007
    Location
    Tupelo, MS
    Posts
    8,463
    Images
    353
    Quote Originally Posted by motorapido View Post
    .... But, a down bag can gain, on average, a pound of weight per day on the trail from insensible perspiration that gets trapped in it as you sleep, and you can rarely dry a bag out on the trail properly. So the 3.9 ounce weight penalty goes away on the second day of the hike, and turns into a 12 ounce savings. On the third day, you enjoy a 28 ounce weight savings. Fourth day, 44 ounces. This is big weight savings on a multiple day hike. Plus, you sleep warmer -- maybe 10 to 20 degrees according to what you read. Keep the tarp rigged to block wind, and you have a very toasty, inexpensive, ultralight setup without all the fiddling around with top quilts and bottom quilts, etc.

    This video shows the hammock-through-back setup, but doesn't show the mylar vapor barrier. http://www.youtube.com/watch?v=4C9hZYe4dno
    No argument about quilts gaining weight day after day from condensation. But a pound per day seems a bit much. I would think that just 1 lb of water added to a down quilt would pretty much wipe it out insulation wise. Where did you get these figures? Not that I don't believe you. But I am curious as to where you got this? I can see a few oz, but a lb? Unless maybe under Arctic conditions.

    But anyway, a VB should cut that to zero or close.
    For I consider that the sufferings of this present time are not worthy to be compared with the glory that is to be revealed to us....that the creation itself also will be set free from its slavery to corruption into the freedom of the glory of the children of God. For we know that the whole creation groans and suffers the pains of childbirth together until now.
    Romans 8:18,21-22

  5. #5
    Joey's Avatar
    Join Date
    Dec 2010
    Location
    Western Maryland
    Posts
    1,808
    Images
    51
    I haven't tried the VB concept yet. Maybe next fall/winter I'll give it a go. My system worked fairly well for me this year, after a bit of tweaking. Always looking for ways to improve. Thanks for sharing!

  6. #6
    thats by no means ultralite. I think its an interesting concept, but needs substantial testing at temps maintained below freezing in multi day treks, before it's a "solution"

    Checkout the winter camping section of bpl, there are lots of threads on vbl use and its draw backs and pluses.

  7. #7
    Senior Member
    Join Date
    Sep 2010
    Location
    harrisburg, pa
    Hammock
    Grand Trunk Nano 7 or Byer Moskito
    Tarp
    zpacks cuben
    Insulation
    Down bag cocoon
    Suspension
    1" straps/whoopies
    Posts
    114

    Whadya mean it's not ultralight?

    I can't imagine a lighter 3 or 4 season setup than I've outlined for hammocking. I've used it to 20 degrees, comfortably. With a smartwool balaclava on my head, topped with a fleece beanie, it's a toasty way to spend a night in the cold woods. Can I go lighter? Somebody tell me how. Every gram saved is more Everclear that I can bring!

  8. #8
    MarshLaw303's Avatar
    Join Date
    Oct 2008
    Location
    Winona, MN
    Hammock
    11' gathered end
    Tarp
    Flat
    Insulation
    Revolt/Rev
    Suspension
    Whoopies
    Posts
    333
    isn't it uncomfortable to sleep in the banana shape like that? I also like the pea-pod ideas but can't get past the curved back and hyper extended knees. Am i missing it?

    -Tim

  9. #9
    Senior Member NCPatrick's Avatar
    Join Date
    Oct 2006
    Location
    Winston-Salem, NC
    Hammock
    WB Traveler
    Tarp
    Custom OES tarp
    Insulation
    JRB Down UQ/TQ
    Suspension
    Whoopie slings
    Posts
    9,041
    Images
    40
    Quote Originally Posted by vesteroid View Post
    thats by no means ultralite. I think its an interesting concept, but needs substantial testing at temps maintained below freezing in multi day treks, before it's a "solution"

    Checkout the winter camping section of bpl, there are lots of threads on vbl use and its draw backs and pluses.
    Well, hey. You've got to put a title on your post, and it sure wasn't implied that his solution was also going to be your solution. I think giving folks a little leeway here and there is a good thing.


    "Civilization is the limitless multiplication of unnecessary necessities."
    - Mark Twain
    I go to nature to be soothed and healed, and to have my senses put in order.
    - John Burroughs

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •