Western Mountaineering

MityLite 40°F Down Sleeping Bag


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The Western Mountaineering MityLite 40 Degree Down Sleeping Bag is perfect for a summer getaway or a budget trip to Europe when you know you’ll be spending your nights at the local hostels. Packed with 12 ounces of down fill creating a 3 inch loft that will keep you comfortable in temperatures down to 40 degrees Fahrenheit.


This sewn thru semi-rectangular bag features a full length zipper that can be opened up to create a lightweight comforter or zipped to the Western Mountaineering Summer Coupler to sleep two. At just 1 pound 10 ounces this highly compressible bag takes up no space at all in your pack or carry-on.


All Western Mountaineering sleeping bags are made right here in the USA.  Find out more about Western Mountaineering here.





  • Semi-rectangular bag that can be turned into a comforter or zipped to a Summer Coupler
  • Lightweight ripstop nylon shell with DWR finish
  • 12 oz 850 plus fill power goose down create a 3 inch loft
  • Lightweight
  • Very compressible
  • 40° F temperature rating
  • 6" spacing/continuous chambers 
  • Sewn thru construction
  • Full-length #5 YKK zipper
  • Available in 6’ 3” length only
  • Stuff sack and storage bag included
  • Made in USA



Western Mountaineering MityLite Sleeping Bag


MityLite 6'3" length


  • Rating: 40° F
  • Loft: 3”
  • Inside girth (shoulder/hip/foot): 62"/59"/46"
  • Fill weight: 12 oz
  • Total weight: 1 lb 10 oz
  • Stuff sack size: 6"x12"

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Western Mountaineering

MityLite 40°F Down Sleeping Bag


Item # MITY

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