Big Agnes Lithia Spring SL

Priced: $349.95 - $379.95 Rated:   - 5 stars out of 5 by 3 reviews.
Big Agnes Lithia Spring SL
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Color: Purple / Gray
Available Colors:
Big Agnes Lithia Spring SL -
FEATURES of the Big Agnes Women's Lithia Spring SL 15 Degree Sleeping Bag.
SPECIFICATIONS of the Big Agnes Women's Lithia Spring SL 15 Degree Sleeping Bag.


  • Draft collar stops heat from leaking our around your head


  • Extra insulation in foot box area for Women's bags
  • Proprietary application process creates a water repellent, antimicrobial and antibacterial down insulation that actually floats on water
  • DownTek down repels water and maintains loft and insulation value, even when exposed to moisture
  • 700-fill DownTek insulation gives you the light weight and insulative power of down with the added benefit of negating the negative effects of moisture and humidity that have been the classic arch-enemy of down
  • DownTek 700-fill-power duck down repels water employing nano technology and a proprietary process to apply a micro-thin polymer to the down
  • Vertical chambers with internal mesh gates keep insulation from shifting up and down
  • Down-filled collar at top seals around the neck to prevent warm air from escaping and cold air from entering


  • Designed to decrease weight and size, while increasing thermal value using the traditional mummy shape


  • European Norm (EN) comfort rating of 15°F makes the bag suitable for 3-season use and occasional winter outings


  • Mate together left and right zip bags
  • 2-way, full-length YKK zipper zips to other bags of opposite configuration
  • 60" / 152 cm YKK #8 zipper - petite bags


  • The women's Big Agnes Lithia Spring SL mummy sleeping bag includes a mesh storage sack and a nylon stuff sack
  • Shell is nylon rip-stop, breathable and down proof with water repellent finish
  • Tough nylon stuff sack hauls your bag when you're on the trail, and the mesh storage sack helps the down air out and decompress when you're at home
  • Ripstop nylon shell has a water-repellent finish to shed water
  • Fully-insulated construction protects you from cold air and the cold ground
  • Insotect Flow Construction
  • Moisture-resistant nylon shell is durable but keeps the weight down, and it helps shed moisture from condensation and dew
  • Interior fabric loops stabilize a sleeping bag liner, sold separately

Lining and Layers:

  • Taffeta lining is soft and won't wear out even after seasons of use


  • Traditional mummy design holds in warmth, cuts down on unnecessary bulk, and fits with a wide range of sleeping pads


  • Traditionally insulated bags designed without the integrated pad sleeve found on Big Agnes System bags


  • Contoured hood features a draw cord and cord lock for easy adjustment


  • Draft-stopping 70-inch zipper (60 inches on petite sizes)along the right side makes getting in and out easy and gives you complete venting options for warm nights


  • 15-degree-rated bag will see you through cool nights and shoulder season backpacking trips
  • Liner loops hold your personal sleeping bag liner in place so it won't shift around inside of the bag
  • European Norm (EN) is an independent third-party temperature rating, allowing accurate comparisons across brands with other EN-rated bags
  • Insotech Flow baffle design offers uniform heat distribution by encouraging heat to move from body areas that produce a lot of heat to areas that tend to be colder
  • Exterior loops for hang drying or storage
The Big Agnes™ Lithia Spring sleeping bag is perfect for either snuggling up to a hot spring or taking a breather next to a fire.
Traditional mummy shaped bag without the pad sleeve.
Interior fabric loops for sleeping bag liners.
70" YKK #8 zipper lets you mate together any of our left and right regular zip bags with the same size.
No-draft collar seals around neck to keep cold air from sneaking in.
No-draft wedge insulates the connection between the bag and pad.
No-draft zipper tube insulates along the length of the zipper.
Shell is made of DownTek™ water repellent and constructed with Insotect Flow™ patent technology.
Fill Type - 700 DownTek™
Bag Weight - 3lb 2 ounces.
Shoulder Girth - 56"
Hip Girth - 56"
Foot Girth - 36"
Stuff Sack Size - M - 8" x 17.5"
Compressed Bag Size - 9" x 9"

The new Lithia Spring SL bag from Big Agnes is full of features for those who prefer a traditional mummy bag. The Lithia Spring SL sports the new DownTek 700 fill down, which is treated using a nano-technology that makes the down water resistant as well as anti-microbial and anti-bacterial. The zippers allow you to mate right and left bags. Mesh storage sack and nylon stuff sack included.

The Big Agnes Women's Lithia Spring SL 15 Degree Down Sleeping Bag takes a step away from standard Big Agnes's bags, with their uninsulated bottoms and offers the all-around warmth of traditional mummy bag. Zip up in this bag if you're looking for the solid warmth and moisture-resistance of DownTek, and you want the top-to-bottom insulation of familiar mummy bags.


The women's Big Agnes Lithia Spring SL mummy sleeping bag features DownTek™ water-repellent down insulation. You'll never dread a rainy backpacking trip again.


Mountain Gear
For those that prefer a traditional down mummy bag on late season trips, it doesn't get better than Big Agnes' Lithia Spring SL +15 Down Sleeping Bag.
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Average Price History: Price History
Review RatingNumber of Reviews
Bag Shape:Mummy
Bag Weight:3 lbs 2 oz / 1417 g
Cold Rating:15º.
Compressed Dimension:9 x 9" / 23 x 23 cm
Compressed volume:Yes
Draft Collar:Collar
EN comfort (rating for women):2 degrees Fahrenheit
EN lower limit (rating for men):Backpacking
Fill:2 lbs. 9 oz.
Fill Material:700 Fill Down
Fill Weight:23 oz / 650 g (Petite); 28 oz / 800 g (Regular)
Fit up to:5'10" / 178 cm
Fits up to (in.):Ripstop nylon
Foot Dimension:34 inches
Foot Girth:34 in / 86 cm (Petite); 36 in / 91 cm (Regular)
Hip Dimension:54 inches
Hip Girth:54 in / 137 cm (Petite); 56 in / 142 cm (Regular)
Hip girth (in.):Down
Insulation:700 Fill Duck Down
Insulation Type:700+ Down Insulation
Liner Material:Nylon
Lining:1.16 kilograms
Lining Material:Nylon Taffeta
Material:Rip-Stop Nylon
Max User Height:5 ft 6 in (Women's Petite or Short), 5 ft 6 in (Women's Regular)
Packed Size:8.5 x 9 in / 22 x 23 cm
Shell:15 degrees Fahrenheit
Shell Material:Nylon
Shoulder Dimension:54 inches
Shoulder Girth:54 in / 137 cm (Petite); 56 in / 142 cm (Regular)
Shoulder girth (in.):Ripstop nylon
Sleeping bag shape:1.42 kilograms
Storage Sack Included:yes
Stuff Sack Dimension:(M)
Stuff Sack Volume:8x17.5 inches
Stuff sack size:Down
Temperature Range:11° to 20°
Temperature Rating:15° F / -9° C
Temperature rating (C):15 degrees Fahrenheit
Temperature rating (F):2 degrees Fahrenheit
Water-resistant down:-9 degrees Celsius
Weight:2 lb 6 oz / 1077 g (Petite); 2 lb 13 oz / 1275 g (Regular)
Weight - metric:15 degrees Fahrenheit
Zipper Length:3/4
Zipper Side:Right

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Big Agnes Lithia Spring SL Reviews:


Rainy Backpacking Trip but still warm!

I was freezing cold last year in my ten year old synthetic twenty degree bag, so I bought this one when it was on sale at REI's labor day sale. I went backpacking the next week and it rained every night and most of every day and it was cold. I was so happy to crawl into my bag each night and finally be warm again. It turns out our tent isn't anywhere near waterproof (might be time to upgrade that as well. So every morning I woke up and the bottom half of the sleeping bag was soaked, but I definitely couldn't tell on the inside. The only downside I saw was that it doesn't pack that small, just barely fit with stuffing into the sleeping bag compartment in my pack. But I'm willing to have to work a little to stuff it in my bag to be warm at night. Also, I used an REI compression sack made for a synthetic bag rather than the compression sack that came with the bag as it was far too large. In the REI compression sack I managed to get it small enough to fit.
Bora at REI on 09/09/2013

Amazing bag

This sleeping bag made my trip! I was on a two week backpacking trip in the high deserts of southern Utah and this bag was warm and comfortable as the night temperatures ranged from 45 to 19 degrees. The interior fabric is soft and allowed for easy rolling over. I used an REI compression sack, and it fit easily in my pack with my tent. The zipper was easy to pull from all angles. Super impressed.
clucking at REI on 10/10/2013

Great Sleeping bag

Took this sleeping bag on a 6 day bicycling/camping trip, had temperatures down to mid 30s at night, never got cold in the bag.
Shad at REI on 10/10/2013