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Big Agnes Mystic UL Sleeping Bag: 15F Down


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Mystic UL Sleeping Bag

Weighing in at less than 2.5 pounds, the Big Agnes Mystic UL 15 Degree Down Sleeping Bag is your new best friend whether you're out for one night or several. This bag features plenty of warmth for most camping conditions, and thanks to its integrated pad sleeve it sheds bottom insulation to make it a super light refuge. Don't think for a second that it sacrifices warmth, though—it's loaded up with 850-fill DownTek water-repellent down that's arranged in Insotect Flow vertical baffles. The baffles conform to your body for increased warmth and comfort and use internal gates to keep the down in place so you don't have to deal with cold spots.

Not only is the down water-repellent, but the Pertex ripstop nylon fabric has a DWR treatment that deflects moisture like tent condensation. The rectangular shape means you have a few sleep-position options. Drafts tremble in fear before the Mystic thanks to the no-draft collar, wedge, and zipper that keep them locked out and your heat locked in.

  • Lightweight sleeping bag that's ready for adventure
  • DownTek compresses well and won't collapse when wet
  • DWR treatment sheds dew and condensation
  • Pad retainer sleeve minimizes weight
  • Insotect Flow baffles minimize cold spots and drafts
  • Draft collar seals out chilly gusts of wind
  • Item #BAG00ER

[shell] Pertex nylon ripstop, DWR, [lining] nylon taffeta
850-fill DownTek
Max User Height
[regular] 5ft 10in, [long] 6ft 6in
Shoulder Circumference
[regular] 69in, [long] 72in
Hip Circumference
[regular] 63in, [long] 66in
Foot Circumference
Draft Tube
Pad Retainer
[small] 20 - 25 x 72in, [regular] 20 - 25 x 72in, [long] 20 - 25 x 78in
Fill Weight
[regular] 12oz, [long] 14oz
Stuff Sack
Stuff Size
8 x 17.5in
Claimed Weight
[regular] 2lb 7oz, [long] 2lb 11oz
Recommended Use
backpacking, weekend camping
Manufacturer Warranty

Tech Specs

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UL Down System Bag with Flex Pad Sleeve

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.