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Big Agnes McAlpin SL Sleeping Bag

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  • DownTek 700-fill-power duck down repels water employing nano technology and a proprietary process to apply a micro-thin polymer to the down
  • DownTek down repels water and maintains loft and insulation value, even when exposed to moisture
  • Proprietary application process creates a water repellent, antimicrobial and antibacterial down insulation that actually floats on water
  • Vertical chambers with internal mesh gates keep insulation from shifting up and down
  • Traditional style mummy bag is designed without the integrated pad sleeve (normally found on Big Agnes System bags) and features full insulation underneath
  • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags
  • Ripstop nylon shell has a water repellent finish to shed water
  • Nylon taffeta lining is soft and breathable
  • Down-filled collar at top seals around the neck to prevent warm air from escaping and cold air from entering
  • Large draft tube located behind the zipper prevents warm air from escaping and cold air from entering
  • Interior fabric loops stabilize a sleeping bag liner, sold separately
  • 2-way, full-length YKK zipper zips to other bags of opposite configuration
  • Big Agnes McAlpin SL mummy sleeping bag includes a mesh storage sack and a nylon stuff sack


Item 845145

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Big Agnes McAlpin SL Sleeping Bag Specs
Best use
5 degrees Fahrenheit
5 degrees Fahrenheit
-15 degrees Celsius
2 lbs. 15 oz. / 3 lbs. 2 oz.
1.33 / 1.41 kilograms
Ripstop nylon
700-fill duck down
28 / 30 ounces
70 / 78 inches
60 / 62 inches
54 / 56 inches
9 x 17.5 / 10 x 17.5 inches
27 / 27
EN lower limit (rating for men)
EN comfort (rating for women)
Temperature rating (F)
Temperature rating (C)
Weight - metric
Insulation type
Water-resistant down
Fill weight
Sleeping bag shape
Fits up to (in.)
Shoulder girth (in.)
Hip girth (in.)
Stuff sack size
Stuff sack volume

Big Agnes McAlpin SL Sleeping Bag

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Rated 4.0/5 based on 5 reviews
Rated 5out of5
by fromZero Degrees and Comfy Ideally, my first winter camping trip should have been about 20 degrees overnight... Turned out to be zero. The new bag, combined with a quality insert liner, provided a very nice night of sleep. The bag gets the "Goldilocks Award"...not too hot...not too cold...just right!
Date published: 2014-01-02
Rated 1out of5
by fromCome on Big Agnes So I am looking for a new down bag ... as a 5' 11" large breasted woman NO women's bags work for me (short and narrow shoulder cut), so I always go for a men's bag, everything else about this bag fits the bill BUT it tops out at 70 inches and all of BA's women's bags are way short OR they offer a bulky "semi" mummy bag = heavy load. Where are these hobbits? Or am I the weird one?
Date published: 2013-05-30
Rated 4out of5
by fromSolid Bag for Cold Weather Made first trip with Big Agnes McAlpin SL last month in CO. Found bag to be more spacious than other reviews suggested (Large size - I'm 6', 200lbs). Temps in 30's - I was comfortable; not too hot, nor too cold. The bag, even when compressed is pretty bulky compared to other. albeit lighter weight, down bags I have owned - a consideration for backpacking. It's a pretty shiny shell and, in uneven sites, I found myself "sliding" to the low end of the tent - not a big issue, but worthly of mention.
Date published: 2013-10-01
Rated 5out of5
by fromExceptional Product I did say that I am a minimalist in my gear style, but even for being a minimalist this sleeping bag combined with the insulated mummy pad from Big Agnes were almost as comfortable as a pillow top mattress. I usually have a hard time sleeping this combination was the best ever. I slept like a bear every night on my 8 days trip, and none of my limbs were cold. It is true that this sleeping bag is expensive but it is a life long investment. I am going to be using it on many trips to come. I said it's a 4 season sleeping bag but I did not try it in the summer yet. For cold weather it definitely did what it is supposed to do. Comparing it with my limited experience with nice sleeping bags I really think it was roomy for my kind of height and built (5'7 in, 164 lbs), I bought the regular size. I am very happy with this product and can't wait for the next opportunity to use it!
Date published: 2012-12-18
Rated 5out of5
by fromGreat bag for low temps. Spent a cold night (high 20s/low 30s) at China Hole at Henry Coe SP. The McAlpin kept me warm and comfortable while wearing a base layer and beanie. In the morning the outer shell was very cold to the touch, but the inside was warm and dry. I am interested to see how well the down will repel water during a rain. The included stuff sack is an appropriate size, but still leaves some room for compression in your backpack. I wish it was a *tad* wider, but certainly not a deal breaker. Overall, I would purchase again.
Date published: 2013-01-01

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