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Mystic SL 15° Long Big Agnes

Item Code: BMSLL

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Mystic SL 15° Long Big Agnes: Classic Superlight down bag captures the spirit of the west, of adventure and unrestrained freedom.

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Mystic SL 15° Long Big Agnes

Mystic SL 15° Long Big Agnes: Classic Superlight down bag captures the spirit of the west, of adventure and unrestrained freedom.

Mystic SL 15° Long Big Agnes:

  • Size: Fits up to 5'10"
  • 800 fill DownTek/Fill Weight: 16.5oz
  • Bag Weight: 2lb 7oz
  • Girth: Shoulder 73"/Hip 69"/Foot 55"
  • Stuff Sack Size: M-8"x17.5" / Compressed Bag Size: 8.5"x8.5"
  • Color: Green/Black
  • Pad Size: 20"x78" / rectangular

Mystic SL 15° Long Big Agnes: If you feel claustrophobic in the confines of a mummy bag, then welcome to the unfettered open space of a semi-rectangular bag made with super lightweight materials. Integrated full pad sleeve means you will never roll off your pad again.

Mystic SL 15° Long Big Agnes: DownTek™ water repellent down insulation - warm, dry and environmental friendly. Rectangular shape offers more room in foot box and shoulders. Recycled mesh storage sack & nylon stuff sack included. Built in pillow pocket holds a fleece or Big Agnes pillow for extra comfort. 70" YKK #5 zipper allows you to mate together Big Agnes left and right zip bags with same size zipper.
Mystic SL 15° Long Big Agnes: Insotect Flow™ is a flow-optimized insulation system that delivers uniform heat distribution and natural body contouring through its revolutionary baffle design. Materials include Pertex® rip-stop nylon - Featherweight, high thread-count fabric that is soft as silk with a small packing volume. WR surface treatment to repel water and the lining is nylon taffeta. No-draft collar, wedge and zipper tube keep cold air from sneaking in.

Big Agnes Website


In stock items will ship within the next business day. Available item(s) is/are available to order. Most available items will ship within 9 business days, sometimes the process is faster and of course it will ship to you ASAP. There might be some exceptions, example: supplier is out of stock or manufacturing delays. If you have any doubt your item is in stock please call us at 303-984-4649.

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If you placed an order at 123Mountain and you don't like it just send it back for a refund, applicable for the item not shipping costs*. Ship it back and as long as your item is in unused condition with original tags, boxes, etc.  Please follow the steps at Return Policy Page.

No returns on sale / promotional / discounted item(s).

* Even if the shipping was free we paid the carrier for the service provided and we will deduct $7.95 for Economy, $12.95 for Ground, etc.



Not stoked on your gear? Looking to return it? No problem, we have an Unlimited Return Policy as long as item(s) is/are in UNUSED CONDITION. We try to guarantee complete satisfaction with unlimited lifetime returns. If at any time - now, next month, in 30 years - you're not 100% satisfied, send your gear back for a refund. No questions asked. Check out Return Policy Page here. No returns on sale / promotional / discounted items, though.


We need your help to always make sure 123Mountain has the best prices! You may even benefit in the process. If you find an identical product at a lower price and in stock through another online site we will refund two times the difference.

Here's how it works:
•    Place the order on at our current price.
•    Email us within 24 hours that you are requesting a price match, including a link to the site where you saw the lower price.
•    We will adjust the price and take care of your refund.

For further information please go to 100% SATISFACTION page.


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