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  1. #11

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    Mylar balloons 16 inches or larger diameter will have a valve. Flat material bonded into a tail will form a valve by itself.
    I love the unimproved works of God. - Horace Kephart

  2. #12
    Yoda's Avatar
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    Dave,

    Not sure if this is a solution for you, but just a thought!?!?

    Granite Gear Event Cuben Dry sacks use a waterproof VERY THIN layer of event bonded to the bottom of the dry sack which allows the user to stuff in the item close and force the air out and since it is a membrane that allows air out but not in (also doesnt allow water in either) it functions like what you are looking for! Here's a link to the product : http://www.prolitegear.com/granite-g...3-drysack.html

    Not sure if you can source the event that Granite Gear is using, but it's a option!?!?
    Formerly known as "Cranky Bear"....

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  3. #13
    Senior Member G.L.P.'s Avatar
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    Very nice.... Very nice i really like this i use ziplock bags all the time backpacking and a cuben ziplock bag would be sweet
    It puts the Underquilt on it's hammock ... It does this whenever it gets cold

  4. #14
    WV's Avatar
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    Quote Originally Posted by Cranky Bear View Post
    Dave,

    Not sure if this is a solution for you, but just a thought!?!?

    Granite Gear Event Cuben Dry sacks use a waterproof VERY THIN layer of event bonded to the bottom of the dry sack which allows the user to stuff in the item close and force the air out and since it is a membrane that allows air out but not in (also doesnt allow water in either) it functions like what you are looking for! Here's a link to the product : http://www.prolitegear.com/granite-g...3-drysack.html

    Not sure if you can source the event that Granite Gear is using, but it's a option!?!?
    Very interesting. I hadn't seen these. I suspect they let air both out and in, just not water, but I don't think that's a problem in a stuff sack. Letting the air out is a real plus. Thanks.

  5. #15

  6. #16
    New Member
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    I would second DavyRay. Creating a two layers like a whoopie cushion (hehe whoopie) would stop the flow of air as well as stop air/water from coming in. It may be the simplest solution, and the fact that cuben does not stretch and can be taped would also be positive factors. It probably also depends on the amount of air pressure. May be a bit of a pain to release the air as well.

    Plus if it does work, overpressure would cause the insulation to fart. I can think of a couple of names for the finished product as well.

    Born_Old

  7. #17
    tncamper's Avatar
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    I'm thinking Mylar balloons, but I'm not sure how they function on multiple uses.
    It'll be alright Friday!


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  8. #18
    tncamper's Avatar
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    Sorry DavyRay, I spoke before realizing there were 2 pages to this thing.
    It'll be alright Friday!


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  9. #19
    New Member
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    Nice! Does it stay closed though?

  10. #20

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    Quote Originally Posted by Born_Old View Post
    I would second DavyRay. Creating a two layers like a whoopie cushion (hehe whoopie)
    Ohh, pleeese do this. I would love to hear you venting the stuff sacks when you are packing up. Think of the entertainment value.
    jason

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