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Big Agnes


Big Agnes Lost Ranger 3in1 15 Sleeping Bag

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Versatile sleeping system designed for year round comfort. 

 The Lost Ranger 3N1 15° sleeping bag is part of our latest evolution of the Big Agnes Sleep System. This modular bag design offers just what you’d expect: three bag configurations in one simple, yet technical sleep system that stays attached to your pad, so you won’t roll off in the middle of the night. It's the only bag you need for 3-season camping, backpacking and everywhere in between. These lightweight, down-fill bags deliver comfort and versatility no matter your sleep style or temperature preference.


  • 3N1 System Bags offer three bag configurations for temperature versatility with a technical, roomy sleeping space that keeps you on your pad throughout the night
  • 650 fill DownTek™ repels water while maintaining insulating value - bluesign® Certified PFC-free water-repellent chemistry 
  • Pad Cinch System is adjustable to a variety of pad sizes. The self-equalizing drawstring easily connects bag to pad and the middle securement feature provides extra stability
  • Maximum thermal efficiency is achieved when inner and outer bags are layered, using offset quilted construction to minimize cold spots 
  • Sleep on any side using the inner bag alone and within the outer bag. Three-quarter, anti-snag, ambidextrous zipper stays out of the way when side sleeping 
  • The inner bag design mimics our award-winning Sidewinder sleeping bag, designed for side sleepers and made to move with you from side to side 
  • Keep your head snug and warm using the inner bag with jacket-style hood 
  • Spacious, rectangular shaped outer bag is constructed with no-draft collar, no-draft wedge, and a single no-draft, anti-snag left side zipper with zipper garage 
  • Ultimate comfort and additional hand warmth with hand tuck pockets at the top of outer bag 
  • Access from top and bottom of both inner and outer bag with two-way zipper for easy temperature control throughout the night 
  • Easy access to discreet pillow barn on pad sleeve, keeps your pillow tucked in all night
  • Create a doublewide system bag by mating two 3N1 bags
  • Regular and Long sized bags available
  • Storage sack & stuff sack included


  • Shell: Lightweight nylon ripstop
  • Outer bag lining and Inner bag: GRS certified 100% post-consumer recycled polyester taffeta featuring a PFC-free water-repellent finish
  • Pad sleeve: Lightweight nylon ripstop
  • 650 fill DownTek™ repels water while maintaining insulating value - bluesign® Certified PFC-free water-repellent chemistry 
  • Quilted construction


Model Regular  Long
Total Weight 2lb 13oz / 1.28kg
3lb 1oz / 1.39kg
Inner Bag Weight 1lb 4oz / 567g 1lb 6oz / 624g
Outer Bag Weight
1lb 8oz / 680g
1lb 11oz / 765g
Fill Type
650 DownTek
650 DownTek
Total Fill Weight 19oz / 539g 21oz / 595g
Inner Bag Fill Weight 10oz / 283g 11oz / 312g
Outer Bag Fill Weight 9oz / 255g 10oz / 283g
Compressed Bag Size 9"x8" / 23x20cm 9.5"x9.5" / 24x24cm
Stuff Sack Size

14L 8"x17.5" / 20x45cm

14L 8"x17.5" / 20x45cm
Max User Height 6' / 183cm / 183cm 6'6" / 198cm
Rec Pad Size





Shoulder Girth

62"(Inner) 69"(Outer)

157cm(Inner) 175cm(Outer)

65"(Inner) 72"(Outer)

165cm(Inner) 183cm(Outer)

Hip Girth

54"(Inner) 61"(Outer)

137cm(Inner) 155cm(Outer)

57"(Inner) 64"(Outer)

145cm(Inner) 163cm(Outer)

Foot Girth

43"(Inner) 55"(Outer)


46"(Inner) 58"(Outer)

117cm(Inner) 147cm(Outer)

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