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Big Agnes


Big Agnes Mystic UL 15 Sleeping Bag


The Mystic UL 15 is one of our most technically designed Big Agnes System bags, using our Flex Pad Sleeve design, a very durable nylon ripstop shell fabric, and super cozy 850 fill power DownTek™ water repellent insulation. This bag combines ultralight versatility with a long line of packable creature comforts. Whether you’re a 3/4 length-pad-carrying, fast fly tent-gram-counter or just gearing up for a trip where weight and packed size is important, this is the go-to bag for you.

Bag Weight Small: 1lb 13oz / 822g / Regular: 2lb / 907g / Long: 2lb 5oz / 1.05kg
Fill Weight Small: 13oz / 369g / Regular: 14oz / 397g / Long: 16oz / 454g
Compressed Bag Size Small: 5" X 6" / 13 X 15cm / Regular: 6" X 7" / 15 X 18cm / Long: 7" X 8" / 18 X 20cm
Stuff Sack Size Small: M 8" x 17.5" / M 20 x 45cm / Regular: M 8" x 17.5" / M 20 x 45cm / Long: M 8" x 17.5" / M 20 x 45 cm
Sleeping Bag Type Big Agnes System Bags


  • The lightest Big Agnes System bags offer technical, roomy sleeping spaces for those who aren't willing to sacrifice comfort or compressibility 
  • Streamlined silhouette for increased thermal efficiency 
  • Flex Pad Sleeve features stretch construction that accommodates multiple pad widths, and easily connects your bag to your pad  
  • Small, Regular and Long bags fit 20" - 25" wide pads
  • Free Range Hood gives you the freedom to lift your head. Jacket-style hood opening contours to the shape of your face for a comfortable, snug fit
  • Rectangular shaped bag
  • DownTek™ - a water repellent down that uses a PFC-Free, bluesign™ approved chemistry
  • Anti-snag zipper for a smooth, quick zip 
  • Small: 60" / 152cm YKK #5 anti-snag locking zipper
  • Regular: 65" / 165cm YKK #5 anti-snag locking zipper
  • Long: 70" / 178cm YKK #5 anti-snag locking zipper
  • Zipper Garage 
  • Mate together left and right zip bags
  • No-draft collar, no-draft wedge, no-draft zipper
  • Interior fabric loops for sleeping bag liners
  • Exterior loops for hang drying or storage
  • Mesh storage sack & polyester ripstop stuff sack

Nylon ripstop shell fabric with a water repellent finish 

Nylon taffeta lining 

Insotect Flow™ construction

850 fill DownTek™ - a water repellent down that uses a PFC-Free, bluesign™ approved chemistry.

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