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Big Agnes - Mystic UL 15

The Big Agnes Mystic UL 15 combines light weight with superb compressibility, making it an ideal companion for all your ultralight excursions. Water-repellent DownTek™ insulation stays loftier, longer than traditional down, and also dries more quickly if it gets a little damp. Big Agnes Classic Series bags combine a roomier contour shape with a narrower pad sleeve to provide an overall more comfortable and cozier sleeping experience than ever before. They've also redesigned the bag to be taller across the top so you can roll over more freely. The ergonomic hood gives you more range of motion so that you can move unrestricted while staying hooded.
This bag uses a full pad sleeve design: the bottom of the bag is non-insulated to save space and weight. It requires a 20-inch wide pad underneath for comfy, warm insulation.
What's in a Name?
In 1901, the town site of Mystic, Colorado was named by Fred May, a settler and rancher, after his boyhood home in Mystic, Iowa. Now the land is literally nothing but a crossroads west of Steamboat Springs. It’s home to a cattle ranch, the occasional tumbleweed and the whispers of the pioneers who once lived there.

Technical specifications & features

Weight Reg: 2 lbs 5 oz
Long: 2 lbs 9 oz
Gender Men's & Unisex
Mfg Sku/Part Number BMUL
Temp Rating º F 15° F
Temp Rating º C -9° C
Bag Style Semi-Rectangular
Seasonal Usage Three Season
Insulation 850 fill DownTek™ water-repellent down
Fill Weight Reg: 14 oz / Long: 16 oz
Bag Length Reg fits users up to 5 ft 10 in
Long fits users up to 6 ft 6 in
Bag Stuff Size 8 x 17.5 in
Circumference at Chest Reg: 70 in / Long: 73 in
Circumference at Hips Reg: 66 in / Long: 69 in
Circumference at Foot Reg: 54 in / Long: 55 in
Other Features - New design improves connection between pad sleeve and bag giving the contour shape a roomier sleeping space without adding bulk
- Integrated full pad sleeve - never roll off your pad again!
- Bottom of bag is non-insulated to save space and weight; requires a pad underneath for insulation
- Regular length uses any 20 x 72 inch pad; Long uses any 20 x 78 inch pad
- Design improves useable interior space and bag drapes over body
- Free Range Hood increases ability to lift and move head even when zipped
- Vaulted foot box creates more wiggle room for your feet
- Stretch fabric panels on the side of the pad sleeves accommodate different pad thicknesses
- Stretch fabric panel beneath hood creates a designated pillow pocket
- One hand hood synch cordlock is simple and easier to use
- Zipper Garage stores zipper and eliminates Velcro
- DownTek™ water repellent down insulation - warm, dry and environmentally friendly
- Liner loops
- 70”/178cm YKK #5 zipper
- Mate together left and right zip bags
- Mesh storage sack & nylon stuff sack
- No-draft collar, No-draft wedge, No-draft zipper
- Exterior loops for hang drying or storage
- Shell fabric is breathable with water repellent finish

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