Big Agnes Betty SL 27 Sleeping Bag (Synthetic)

Priced: $89.28 - $159.95 $89.28
55% off
Regularly: $199.95 $139.97
29% off
Regularly: $199.95
Sierra Trading Post $159.95
20% off
Regularly: $199.95
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Big Agnes Betty SL 27 Sleeping Bag (Synthetic) -

For women who prefer insulation on both the top and bottom of the bag (as opposed to Big Agnes' usual matt-sleeve-on-bottom design), the Big Agnes Betty SL Sleeping Bag is an ideal choice. This bag's unique three-layer insulation helps move sweaty moisture away from your skin while keeping you warm through the chilly nights of late spring and early fall. Vertical baffles control the distribution of insulation from the hood all the way down to the tapered footbox. From the draft-stopping collar at the neck to the no-draft zipper that runs along the side, this bag will provide warmth for car camping by the river or overnighters along the trail.


  • No-draft collar seals around neck to keep cold air from sneaking in


  • Unlike most Big Agnes sleeping bags, the Betty SL has insulation on the top and bottom rather than no insulation on the bottom
  • Pinneco Core insulation is a recyclable insulation that's manufactured free of hazardous chemicals
  • No-draft zipper tube insulates along the length of the zipper
  • 27-degree temperature rating and synthetic insulation means that this bag is ideal for shoulder season camping missions or car camping during late spring and early fall
  • Vertical baffles allow insulation to spread out evenly so you get the most consistent warmth from head to toe
  • Mesh storage sack allows you to store your sleeping bag loosely to maximize the lifespan of the loft of the insulation inside
  • Women-specific design features extra insulation in footbox

Weather and Wind:

  • Mummy shape reduces cold spots and weight


  • Comfort rated to 27°F


  • Zipper allows you to mate left- and right-zip sleeping bags to form one large sleeping bag so two can sleep together and share body heat
  • LEFT OR RIGHT ZIPPER? When you are in the bag, on your back, the right zip will be on your right side, left zip on your left side
  • 70"/178cm YKK #8 zipper - regular bag


  • Liner loops make it easy to attach a lightweight fleece or synthetic liner inside this sleeping bag and keep it in place when you're sleeping
  • Collar, zipper wedge, and zipper all feature draft-stopping construction that keeps cold air from creeping in at the openings
  • Insotect tubic construction uses arched insulation fiber that improves the loft resiliency after this sleeping bag is packed, and it creates larger trapped air space for the most efficient use of thermal energy and warmth
  • Ripstop nylon shell with Durable Water Repellent (DWR) finish is abrasion and water resistant

Lining and Layers:

  • Nylon taffeta lining is soft and smooth so it feels comfortable against your skin when you're sleeping with minimal layers
  • The interior Pinneco layer reflects self-generated body heat, the internal layer traps warmed air for additional warmth, and the outer layer releases sweaty moisture so your skin stays dry


  • Petite size fits women to 5'10"


  • Traditional mummy shaped bag without the pad sleeve
  • No-draft wedge insulate connection between sleeping bag and pad


  • Contoured hood with drawcord adjustment


  • New Pinneco Synthetic insulation is more breathable, thermally efficient and sustainably engineered. It resists water from outside, while the Core Fusion technology seals the insulation like an air pump, actively drawing sweat from inside the bag.
  • Pinneco Core synthetic insulation has a breathable membrane between two layers of durable fibers, so it wicks moisture and retains uniform warmth


  • Made in China
Sierra Trading Post
Designed for fall and winter backcountry adventures, Big Agnes' 27°F Betty SL sleeping bag is filled with Pinneco Core synthetic insulation with a breathable membrane that keeps you warm and dry while sleeping under the stars.

The Big Agnes Betty SL is built for gals who like to get after it, or who just want the best synthetic bag out there. Featuring the latest synthetic technology, Pinneco Core, these bags are engineered to keep you warm, dry and comfortable with as little additional weight gain a synthetic bag could offer.

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Average Price History: Price History
Best Use:Backpacking
Fits to:5'10"
Foot Girth:34 in / 86 cm (Petite); 36 in / 91 cm (Reg)
Hip Girth:54 in / 137 cm (Petite); 56 in / 142 cm (Reg)
Insulation Type:Synthetic Insulation
Lining Material:Nylon Taffeta
Material:Nylon Ripstop shell, Nylon Taffeta bottom
Max User Height:5 ft 6 in (Women's Petite or Short), 5 ft 10 in (Regular)
Packed Size:90 x 11 in / 22.8 x 28 cm
Shoulder Girth:54 in / 137 cm (Petite); 56 in / 142 cm (Reg)
Temperature Range:21° to 30°
Temperature Rating:27°
Weight:3 lb / 1361 g (Petite); 3 lb 7 oz / 1559 g (Reg)

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