Big Agnes Mystic UL 15 Down Sleeping Bag

-9°C Comfort Limit, 397g of 850 Fill Power DownTek (US Method)
Weighs 896g (Regular bag)
Code: SS19345V
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The Mystic UL 15 is part of the classic down series of Big Agnes sleeping bags that offer warmth, compressibility and the Big Agnes System which integrates the sleeping bag and sleeping mat. Now even lighter.

Big Agnes says: 

Ultralight down fill Big Agnes System bags designed to excel in all conditions

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.

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Big Agnes' Mystic UL 15 Down Sleeping Bag is light enough to take backpacking and yet it is more focused on comfort than just the weight. The stretch fabric designed to contain the sleeping mat improves the connection between bag and mat making for a great nights sleep.

The Downtec hydrophobic treated 850 fill power down repels water and speeds up drying time it if does get wet. The lightweight nylon ripstop fabrics are durable and soft to the touch. Vertical side walls help to trap heat closer to your body and the tapered vaulted foot box creates wiggle room for your feet. The bag is well proportioned and quite spacious internally. This would suite people who want that extra space or those who move around a lot as this has the added benefit of the Free Range hood.

To use the full pad sleeve a rectangular sleeping mat is needed and the dimensions of the bag need to match. The material does stretch enough to fit a pillow in too to maximise that comfort.

- Reviewed by Ultralight Outdoor Gear

Help and advice:Choosing a sleeping bag advice
 EN 13537 rating for sleeping bags explained
 Sleeping bag shape and sizes advice
 Sleeping Bag features Page 1
 Sleepin bag features page 2
 All about down filling in sleeping 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 accommodates multiple pad widths. Easy on/off stretch-mesh construction is simple
  • Regular and Long bags fit 20" - 25" wide pads. Wide Long bags fit 25"-30" 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
  • Low profile cordlocks lets you un-cinch the hood with one hand
  • Pillow Barn - keeps your pillow tucked in tight all night
  • Internal hood drawcord gives you a secure, cozy fit when cinched
  • Free Range foot box - creates wiggle room for your feet
  • Rectangular shaped bag
  • DownTek™ water repellent down repels water while maintaining insulating value
  • 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
Fill850 DownTek850 DownTek
Fill weight397g / 14oz454g / 16oz
Stuff sack size20 x 44cm20 x 44cm
Compressed bag size15 x 18cm18 x 20cm
Shoulder Girth
Hip Girth
Foot Girth
Comfort Limit
Pad Size Needed
Rectangular recommended - 51 x 64 x 183cmRectangular recommended - 51 x 64 x 198cm

Materials & Construction

  • Nylon rip-stop shell fabric with a water repellent finish
  • Nylon Taffeta lining
  • Insotect Flow™ construction
  • 850 fill DownTek™ water repellent down
  • Bluesign certified down
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