-9°C

Big Agnes Mystic UL 15 Down Sleeping Bag

-9°C Comfort Limit, 450g of 850 Fill Power DownTek (US Method)
Weighs 958g (Regular bag)
Code: SS17737V
  • From £379.99
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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 bag design which integrates the sleeping bag and sleeping mat.

Big Agnes says: Down fill Big Agnes System bags designed to excel in all conditions and provide more room than a mummy bag.

Classic down series bags offer warmth, compressibility and the Big Agnes System bag design. Lightweight enough for backpacking, these bags are designed to feel more like the comforter on your own bed. They provide an overall more comfortable and cozier sleeping experience than ever before with a semi-rectangle shape and Insotect Flow™ construction that keeps the insulation next to your body for more efficient heat distribution. These bags are taller across the top so you can roll over more freely while the Free Range hood allows you to move unrestricted while staying hooded. So comfortable you won't want to go home.

Big Agnes's Mystic UL 15 Down Sleeping Bag is still light enough to take backpacking but 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 contoured hood will cradle your head for a more comfortable fit.

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. The bag is designed using Insotect Flow technology which uses vertical baffles to transfer heat from the core of your body to your extremities so it will help keep your feet warm.

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 adviceEN 13537 rating for sleeping bags explainedAll about down filling in sleeping bags
Sleeping bag shape and sizes adviceSleeping Bag features Page 1Sleepin bag features page 2
  • Design improves connection between pad sleeve and bag providing a roomier sleeping space without adding bulk
  • Sculpted contour allows the bag to drape around you, increasing insulation performance
  • Free Range Hood design gives you the freedom to lift your head while snuggled in the hood
  • Low profile cordlock lets you un-cinch the hood with one hand
  • Tapered vaulted foot box creates wiggle room for your feet with out creating large cold air pockets
  • Stretch fabric panel beneath hood creates a designated pillow pocket
  • DownTek™ water repellent down repels water while maintaining insulating value
  • Integrated full pad sleeve
  • Rectangular shaped bag
  • Superlight shell fabric with high tear strength
  • 70" / 178cm YKK #5
  • 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 & nylon stuff sack
 RegularLong
Weight958g1058g
Fill850 DownTek850 DownTek
Fill weight450g / 14oz451g / 16oz
Stuff sack size20 x 44cm20 x 44cm
Compressed bag size18 x 19cm20 x 22cm
Length178cm198cm
Shoulder Girth
175cm183cm
Hip Girth
160cm168cm
Foot Girth
133cm133cm
Comfort Limit
-9°C-9°C
Pad Size Needed
Rectangular - 51 x 183cmRectangular - 51 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
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