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forest gnome
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Forest nut...
PostFri Jul 12, 2019 8:47 am 
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So who's done it? on an expensive bag or even a cheap one...

overstuffed my western mountain. bag with 5-6 oz of down and added a draft collar..BEST thing ever!!

have been thinking of ordering an "aegis"? down bag off amazon for like 80$? then buying down from the green lake guy who sells it...

"Darwin on the trail" has some great lightweight tips  and gear stuff on you tube!

ALLSO: do you spray the outside of the bag with a light coating of 3-m scotch-guard or perhaps Nix-wax?
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forest gnome
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Location: north cascades!!
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PostMon Jul 15, 2019 8:00 am 
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so thats 129 people who'v never cut open their bags....personally I would find a cheap synthetic w`horizontal baffles...stuff with 12oz. of down, add draft tube....voila $350 bag!!!
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JonnyQuest
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PostMon Jul 15, 2019 8:29 am 
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Remember there's a sweet spot for down fill pressure.  Adding more down beyond that just adds weight, bulk, and expense without improving warmth.  Reputable bag manufacturers "should" be filling to about that optimum fill pressure.  With most bags now independently rated using a standardized test methodology (formerly EN, now ISO), it behooves the manufactures to optimize pressure for a given temp bag.  Too little down and they don't hit the target temp rating, too much down adds cost without improving temp rating...
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forest gnome
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PostTue Jul 16, 2019 8:33 am 
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interesting...I added about 4 handfuls per baffle..
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JonnyQuest
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PostTue Jul 16, 2019 11:43 am 
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Not saying your efforts didn't provide benefit.  Hence the "should" comment when speaking about bag manufacturers.  It could easily be that your bag was built to hit a temp (or not) yet was not optimized (possibly under filled) for the given baffle heights.  If that's the case, adding down would indeed increase the warmth of the bag.
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Grannyhiker
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PostTue Jul 16, 2019 4:29 pm 
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Considering that Western Mountaineering charges only $32 to add 2 oz. overfill, which, for most DIYers, saves the problem of down floating all over the house, I'd rather let them do it!  Of course that only works if you already have one of their bags!

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May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view.--E.Abbey
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RandyHiker
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PostTue Jul 16, 2019 5:45 pm 
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forest gnome wrote:
have been thinking of ordering an "aegis"? down bag off amazon for like 80$?

This bag?

https://www.amazon.com/AEGISMAX-Urltra-Light-Sleeping-Three-Season-L200cmW86cm/dp/B075N8G9KY/ref=sr_1_3?crid=2SWXSNRZWMHYK&keywords=aegismax%2Bul%2Bsleeping%2Bbag&qid=1563323822&s=gateway&sprefix=aegis%2Caps%2C213&sr=8-3&th=1&psc=1

IDK -- what about buying and trying it out before fiddling with it?   Isn't China the main producer of goose down anyway ?   What makes you think the down from "a guy on green lake" is higher quality?

it would be useful to know whether the shell fabric is actually downproof before stuffing a bunch of expensive replacement down...

Or you could go to Seattle Fabrics and just buy some actual downproof fabric and a pattern and sew from scratch...   I mean you are going to restitching the bag anyway -- so you must have a sewing machine right?
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forest gnome
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Location: north cascades!!
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PostWed Jul 17, 2019 8:50 am 
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ya I think that's the bag... it didn't look to warm but Darwin On the trail gave it a good review- I am sure overstuffing that bag would be good...for those on a budget...
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JonnyQuest
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PostWed Jul 17, 2019 11:21 am 
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Grannyhiker wrote:
Considering that Western Mountaineering charges only $32 to add 2 oz. overfill, which, for most DIYers, saves the problem of down floating all over the house, I'd rather let them do it!  Of course that only works if you already have one of their bags!

The $32 is the starting price point, and is the price to overfill the ExtremeLite" series starting with the MegaLite.  Pricing ramps up from there for the colder weather bags, toping out at $78.  Using the MegaLite as an example, you'd get more bang for your buck by purchasing the TerraLite model where for $25 you get an additional 6oz of down fill.

Also, I'm pretty sure that overfill option is for bags being built to order, and not for modifying an already-owned bag.

Again, I'd hedge my bets that reputable vendors like WM optimize fill pressure in their bags.  By offering overfill they are either...
1:  Indirectly admitting that their stock fill schedules are not optimized for the bag design (baffle chamber volume), or...
2:  Giving the customer what they want, for a price, even if there's limited or no benefit.

I'm guessing the latter  smile.gif
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InFlight
coated in DEET



Joined: 20 May 2015
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coated in DEET
PostWed Jul 17, 2019 10:12 pm 
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Insulation type:800 Fill Power95/5White Goose Down
Zip options:Regular-left;Large-Right
Fill weights (grams):Regular-230g;Large-258g
Bag weights (grams):Regular-408g;Large-528g

At that price point it certainly isnt all 800 Fill Goose Down.  The 95/5 is an odd Qualifier.  Makes me wonder if its 95% Goose Feathers and 5% Goose Down.

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I went to the woods because I wished to live deliberately...  ― Henry David Thoreau
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JonnyQuest
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PostThu Jul 18, 2019 1:10 pm 
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While this thread prompted me to share my thoughts / hypothesis on overfill, it also spurred me into further research.  Many sites speak to it, but the best (and seemingly honest) assessment I found was from Nunatak.  While it does sound like "overfilling" does little to improve the measured temp rating for bags that are optimized with the original fill schedule, it does provide a couple of advantages.  One is that it extends the life of the loft (and performance) between launderings - probably a worthy consideration for through hikers.  The other is that the additional down / fill pressure increases stabilization of the down within the baffled chambers.  Especially for active sleepers that thrash around, this reduces the chances of creating cold spots.
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