Question about "true rating" of MontBell SS UL #1
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Mike Oxford
(moxford) - MLife

Locale: Silicon Valley, CA
Question about "true rating" of MontBell SS UL #1 on 12/26/2012 12:00:10 MST Print View

They market it as a "15deg F" bag.

[EN TESTED]26˚F/ -3˚C(Comfort)、15˚F/ -9˚C(Lower Limit)、-19˚F/ -28˚C(Extreme*)

Given that they call it "comfort female / comfort male / extreme female" all in base-layers, on their description page, would you (personally) use it at -11F in the (non-severe alpine) snow? Is it realistic to get another 25deg while sleeping out of more layers or would you opt to go ahead an rent a warmer bag? (I'm guessing the latter, but I am curious how far the general consensus is on pushing a bag's rating. )

And at that point, do you forgo the tent and just use a snow cave to keep the ambient up? :P

Thanks!

-mox

The Bag
Their definitions for the EN ratings

Edited by moxford on 12/26/2012 12:05:54 MST.

eric chan
(bearbreeder) - F
no on 12/26/2012 12:43:30 MST Print View

add another overbag to get another 15-20F ... then add vbl and clothing

trying to get -11F out of a 15F bag is quite a stretch ... at those temps you have no margin for error

Dave U
(FamilyGuy) - F

Locale: Rockies
Re: no on 12/26/2012 12:59:11 MST Print View

I have always found MB bags optimistic with respect to their warmth rating, despite the restrictions of EN testing. Having said that, Eric is right. Personally, in winter conditions I want a bag that is rated to the expected temps, lest you get into a situation that causes hypothermia or worse. Extreme cold is not an environment to try out some UL tactics that may or may not work for you.

John Abela
(JohnAbela) - MLife
Re: Re: no on 12/26/2012 17:41:45 MST Print View

Ure: I have always found MB bags optimistic with respect to their warmth rating, despite the restrictions of EN testing.


+1

Charles Jennings
(vigilguy) - F

Locale: Northern Utah
Montbell ratings on 12/26/2012 18:32:04 MST Print View

"I have always found MB bags optimistic with respect to their warmth rating, despite the restrictions of EN testing."

Also agree. I am a Montbell retailer, (and Valandre) and have tested several of their bags and jackets. While I like their design, I have been disappointed in their warmth ratings as David stated.

I suspect that it could be due to the use of immature down, but that is only a guess.

Valandre', by comparison, uses mature goose down, and I have found their ratings to be spot on.

Rick M
(rmjapan) - F

Locale: Tokyo, Japan
Re: Question about "true rating" of MontBell SS UL #1 on 12/26/2012 18:44:57 MST Print View

EN testing is new to the 2012 models and the down fill amount was increased 1-2oz accordingly across the line I assume to meet the spec. The 2011 UL Super Spiral Down Hugger #1 Regular has 567g vs 595g of down in the EN-rated 2012 model.

Ben 2 World
(ben2world) - MLife

Locale: So Cal
Re: Question about "true rating" of MontBell SS UL #1 on 12/26/2012 19:22:28 MST Print View

SS UL #1, I don't know, but I have two MB bags -- UL down #3 and the Thermal Sheet -- and I find them spot on at 30 and 50F respectively. I always sleep wearing long silk base layer plus liner socks -- for comfort and to keep body oil / grime away from the bags.

Edited by ben2world on 12/26/2012 19:23:07 MST.