Western Mountaineering Summerlite Sleeping Bag

0°C Comfort Limit, 255g of 850+ Fill Power Down (US Method)
Weighs 525g (Regular bag)
Code: OC1392V
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At just 1 lb 3 oz. the SummerLite is the lightest bag we make in a continuous baffle construction. Our goal in designing this bag was to make it as light as possible without eliminating key features or function. The result is a fully-baffled bag that weighs only 19 ounces and features a full-length zipper with insulated draft protection! The SummerLite is a dream come true for lightweight backpacking fanatics. 

- Continuous Baffle
- Insulated draft Tube
- Extremelite Shell
- Highest Quality Down  

Western Mountaineering down gear has an awesome reputation in the US and that reputation is beginning to build on this side of the pond. Very high quality materials design and construction results in the lightest bags available for a given warmth. 

An example of their attention to detail is their quoted 850+ fill power down used in all their bags: WM quote this figure even though their down generally gets higher ratings in official tests this is because they feel that the official pre-testing preparation enhances the down quality!

One of our customers used this bag on his Lands End to John O'Groats walk, he had this to say:

"The Western Moutaineering sleeping bag was both light weight and warm enough for a Scottish summer. On the first two nights I camped in Cornwall the temperature dropped to around 3 degrees and I did need to don a sweater but that is par for the rating of the bag." Courtesy Trevor James.

Help and advice: Choosing a sleeping bag advice EN 13537 rating for sleeping bags explained All about down filling in sleeping bags
Sleeping bag shape and sizes advice Sleeping Bag features Page 1 Sleepin bag features page 2
  • Continuous Baffle Construction
  • Insulated draft Tube
  • Extremelite Shell
  • Full Length Baffled YKK Zipper
  • Shape: Mummy (w/ full collar)
  • Rating: 0°C / 32° F *
  • Loft: 10cm / 4"
  • Highest Quality minimum 850+ fill power down


  • Length: 165cm / 5'6"
  • Weight: 524g
  • Fill weight: 225g
  • Packed size: 30 x 15cm
  • Internal shoulder girth: 150cm / 59"
  • Internal hip girth: 130cm / 51"
  • Internal foot girth: 97cm / 38"


  • Length: 180cm / 6"
  • Weight: 562g
  • Fill weight: 255g
  • Packed size: 30 x 15cm
  • Internal shoulder girth: 150cm / 59"
  • Internal hip girth: 130cm / 51"
  • Internal foot girth: 97cm / 38"


  • Length: 200cm / 6'6"
  • Weight: 608g
  • Fill weight: 285g
  • Packed size: 30 x 15cm
  • Internal shoulder girth: 152m / 60"
  • Internal hip girth: 132cm / 52"
  • Internal foot girth: 97cm / 38"

* Western Mountaineering state: 'We independently verify own temperature ratings through our own testing, customer feedback and design knowledge. Most of the items in our catalog we have been making for years, which means we have lots of prior knowledge from everyday consumers on what ratings are accurate. We have also EN tested our bags. In every case the EN rating is lower than our posted rating. This means our ratings are more conservative. We do this to ensure that almost everyone will be happy in our bags at the temperature we publish.'

Showing our 1 review for Western Mountaineering Summerlite Sleeping Bag. Write a review ›
Review Summary - 4 out of 5 based on 1 rating.
August 3, 2019 | Paul McNamara
First user

All was OK temperature wise but despite the fact that I am only 5' 9" I found the Regular size (for 6' 0" people) a bit tight around my shoulders/arms. Also a bit tight for my size 11 feet.

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