Zip lock bag zliner

**gaijin42** · 01-08-2011, 13:06

Hrm

http://en.wikipedia.org/wiki/Window_insulation_film

Wikipedia says you have to stay under 1/2 inch to reduce convection so a gallon bag is probably too big. Sandwich bags might work but gives you a lot more effort probably.

**Bradley** · 01-08-2011, 20:08

Here is a post I did on the subject

**lonetracker** · 02-28-2011, 10:42

i did a little experimenting with air as insul.i found some 2.5 gallon zipper lock bags that filled a pocket nicely.i filled three one gallon ziplock bags loosly then put them inside one of the 2.5 gallon bags.i then filled that with as much more air as i could.all the pockets on the left of my clark and the butt end pocket on right were insulated that way.i had a coat zipped over the foot end.the remaining two pockets were insulated with spare woolpants ,gloves,down sleeves,and my wool flannel and vest that i wear dureing the day.i had a down vest and a 1/3 wool blanket on standby to stuff in pockets as needed.
i was fully dressed light poly longunderwear,wool pants,2 wool sweaters,fleece baclava,no socks.went to bed it was about 26degf.covered up with a fleece top quilt.
woke up around 0100 a little chilled both butt pocket bags had gone flat.both areas felt cool. the remaining air filled pockets felt as warm as the ones filled with wool.stuffed my spare things into the flat pockets,added another fleece blanket and went to sleep warmly for the rest of the night.
overnight low was 21degf.
so not to conclusive.the big problem i see is not looseing your air.
the two that stayed full seemed as warm as the rest,but a test with nothing but air in all pockets would be better.if i could hang near home i would try it.this attempt was a mile and a half in the woods so i did not want to commit totally.
definately something to remember if you find yourself out and a little light in the insulation because of changeing weather,or your stuff got wet or whatever.bring some bags.they take up little room and may help keep you warm.

**balloonatic** · 02-28-2011, 10:47

hmm reading this gives me an idea. I think i am going to try using some inflated 260's (animal balloons) inside the ziplock bag. i think this would work well considering how thick the latex is and the different materials to make the different colors. i will let you know what i find out.
balloonatic

**lonetracker** · 02-28-2011, 10:53

oh man,cannot wait to see this.
bill

**lonetracker** · 02-28-2011, 11:06

would also like to see the matching balloon top quilt.

what if

reporter "so this is a camping hammock.could you tell us a little about it"

balonatic "this is a clark hammock,it has these pockets to hold insulation.........i use air for insulation...." said as you are pulling out balloon animals from the pockets.

**balloonatic** · 02-28-2011, 11:16

Originally Posted by lonetracker

would also like to see the matching balloon top quilt.

what if

reporter "so this is a camping hammock.could you tell us a little about it"

balonatic "this is a clark hammock,it has these pockets to hold insulation.........i use air for insulation...." said as you are pulling out balloon animals from the pockets.

I am acttualy tinking about making a full size balloon hammock for an event before i leave if so i think i figured out how for it to hold my weight. i will take pictures i do.
oh that is too funny i wish i did that last week during the interview.

**wolf track** · 02-28-2011, 11:44

I tried the ziplocks filled with air. By the time it hit about 20 °F I woke up freezing. The next night I filled the bags with some down I had, about 2 1/2 inches of loft and slept great down to about 12° F. With a down sleeping bag and thermals. The pockets or ziplocks holding just air helps a little but seemed like putting on a very light windbreaker when you really need a good coat.

**balloonatic** · 02-28-2011, 20:29

I am going to try using balloons and the bags tonight on half the pockets will report tomorrow if i notice a difference.

**Knotty** · 02-28-2011, 22:03

As mentioned by some, dead air is what insulates. Down works by creating many tiny pockets of air that minimize convection. Ziplock bags won't work, other than the benefit of being a vapor barrier. Even air mattresses used in cold weather need to have something inside of them, like the Exped DownMat, otherwise the air convects and provides very little insulation.