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  1. #171
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    I just wanted to confirm what putting the bottle against the femoral artery really means. Is that a polite way of saying "stick the bottle in your crotch"? Or can it be more between the inner thighs and not as high? Seems like that might be a bit uncomfortable with something in that region for the whole night. But I guess being cold would be even more uncomfortable...

    ~Dan

  2. #172
    canoebie's Avatar
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    I put the bottle just below my crotch. If it rides up, I have some great dreams.
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  3. #173
    Senior Member XexorZ's Avatar
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    Quote Originally Posted by angrysparrow View Post
    I'm not sure about that. Your body is already producing energy to heat your core and extremities, and that heat is simply soaked up by the bottle. As long as the bottle isn't so cold that it causes your limbs to chill from contact, the flux in temp of a liquid filled bottle should be very low. Especially when inside the same insulation you are.

    It would almost stand to reason that the more heated mass you have inside your insulation with you, the more stable the temp ought to be. Getting that mass warmed in the first place is where the energy is used.

    Just a thought.
    This would be true if surface area remained constant. Since the additional mass increases surface area the rate of loss is greater. The heat source (you) is still the same so you would need to expend more energy to keep that larger mass warm.

    With that said though, I don't know why a full bladder would be harder to keep warm - I don't think your area expands all that much - but that may be just bad logic on my part.
    Buy Tea at Jennifer's Tea Garden ( My Wife's Place )

  4. #174
    Senior Member XexorZ's Avatar
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    Quote Originally Posted by bowlhaircut View Post
    The only problem here is that the bottle is twice as large as it needs to be.
    This reminds me of a joke...

    To the optimist, the glass is half full.
    To the pessimist the glass is half empty.

    To the engineer (and apparently backpacker) the glass is twice as large as is needs to be.
    Buy Tea at Jennifer's Tea Garden ( My Wife's Place )

  5. #175
    Senior Member XexorZ's Avatar
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    Quote Originally Posted by book View Post
    I plan on trying out two stadium beer cans with screw tops in an AHE Super Dinner Bivy this winter. I want to find out how warm and how strong coffee would be in the morning if I use it instead of just hot water.
    I just tried this (lol) using Miller Lite stadium bottles. These particular bottles are a bit flimsy feeling and I'd be afraid that during the contraction of the water (which is slight if you fill the bottle completely) you could eventually fatigue a crack in them...

    They are also GOD awful hot to handle when screwing the tops on!!
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  6. #176
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    Quote Originally Posted by XexorZ View Post
    I just tried this (lol) using Miller Lite stadium bottles. These particular bottles are a bit flimsy feeling and I'd be afraid that during the contraction of the water (which is slight if you fill the bottle completely) you could eventually fatigue a crack in them...

    They are also GOD awful hot to handle when screwing the tops on!!
    I've only ever used hard sided nalgene's. While I'm sure there are other bottles that would work I don't want to risk it. If it's cold enough to warrant doing this it could be dangerous to be wet.

  7. #177
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    My feelings of using a hot water bottle of any kind to stay warm tells me that
    I don't have as warm a bag as I need for the temptures I'm in.

    Also in the deep cold I have greater fear of getting my bag wet then how
    much xtra heat the water bottle would give.

    If the sleeping system is not keeping you warm, add more layers or more clothing.

    fourdog
    Last edited by fourdog; 10-25-2010 at 11:25. Reason: missed a word

  8. #178
    Roadrunnr72's Avatar
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    Just got my "flexible wide-mouth Nalgene canteen", actually, 3 of them. 36, 48, 96oz. Will try the "heat and sleep" next weekend if it's cold enough. Going up Old Rag Mtn. with a group of scouts.

  9. #179
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    Quote Originally Posted by Roadrunnr72 View Post
    Just got my "flexible wide-mouth Nalgene canteen", actually, 3 of them. 36, 48, 96oz. Will try the "heat and sleep" next weekend if it's cold enough. Going up Old Rag Mtn. with a group of scouts.
    Flexible? I've never seen any one report how well the flexible ones work. Everything I've seen has always recommended using the hard ones. I'd be interested in hearing if the flexible ones work but it would take a lot of positive reports for me to give it a try.

  10. #180
    Roadrunnr72's Avatar
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    Quote Originally Posted by jeepcachr View Post
    Flexible? I've never seen any one report how well the flexible ones work. Everything I've seen has always recommended using the hard ones. I'd be interested in hearing if the flexible ones work but it would take a lot of positive reports for me to give it a try.
    JustJeff was the first to post about them (post #39). That was part of the reason for me buying them, that and 50% off at Nalgene.
    Last edited by Roadrunnr72; 10-30-2010 at 20:14.
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