Star Fire UL 20 (Fall 2022)

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Big Agnes' lightest, most compressible bag series; 850-fill DownTek

The Big Agnes Star Fire UL series are technical, ultralight traditional down mummy bags designed to excel in all conditions. These are Big Agnes' most compressible and ultralight bags, filled with water-repellent 850-fill DownTek and a Pertex shell for water resistance. Body-mapped baffle construction optimizes thermal efficiency.


Brand Name:
Big Agnes
Temp Rating:
20° F
Seasonal Usage:
Three Season
Temp Rating Celsius:
-7° C
Bag Style:
Fill Weight:
Small: 16 oz / 457 g
Reg: 18 oz / 510 g
Long: 20 oz / 567 g
Gray / Pumpkin
850 fill DownTek - bluesign® certified PFOA- and PFOS-free water-repellent chemistry
Small: 1 lb 10 oz / 737 g
Reg: 1 lb 12 oz / 794 g
Long: 2 lbs / 907 g
Bag Length:
Small: fits users up to 5 ft 5 in
Reg: fits users up to 6 ft
Long: fits users up to 6 ft 6 in
Circumference at Chest:
Small: 54 in
Reg: 60 in
Long: 62 in
Circumference at Hips:
Small: 54 in
Reg: 54 in
Long: 56 in
Circumference at Foot:
Small: 34 in
Reg: 36 in
Long: 38 in
Bag Shell Material:
Pertex® Quantum nylon ripstop
Bag Lining Material:
Pertex® Quantum nylon ripstop
Bag Stuff Size:
Small: 7.5 x 15 in
Reg: 7.5 x 15 in
Long: 8 x 17.5 in
Other Features:
• Ultralight down mummy bags that feature 850 fill power DownTek™ down and a Pertex® shell to create our most compressible, technical bags
• Traditional mummy shape allows for lightweight and increased thermal value
• Body mapped baffle construction optimizes thermal efficiency
• 3-D anti-snag draft tube prevents heat loss along the zipper
• Vertically structured sidewalls integrating contoured baffles trap heat closer to the body
• Contoured hood baffles cradle the head for a more comfortable fit
• Oversized interior anti-draft collar
• Ergonomic foot-box construction provides more loft and warmth
• Low-profile cordlock lets you un-cinch the hood with one hand
• Internal hood drawcord gives you a secure, cozy fit when cinched
• Minimal zipper minimizes weight and reduces cold spots
• 40in./102cm YKK #5 anti-snag zipper for a smooth, quick zip
• Zipper Garage
• Interior fabric loops for sleeping bag liners
• Streamlined exterior loops for hang drying or storage
• Storage sack & stuff sack included
Materials & Construction
-- Shell and lining is Pertex® Quantum nylon ripstop
-- 100% recycled Pertex® Quantum uses a tightly woven structure made from incredibly fine yarns, making a light and soft fabric that allows insulation to fully loft and maximize thermal efficiency
-- 850 fill DownTek™ repels water while maintaining insulating value
-- Insotect Flow™ vertical baffles contour to your body to provide a more comfortable fit and keep you warmer

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