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Western Mountaineering Summerlite Sleeping Bag: 32F Down


Summer is the best season to backpack.

The Summerlite 32 Degree Down Sleeping Bag is Western Mountaineering's lightest bag with continuous baffles, ideal for backpacking anywhere from nearby lakes to the faraway alpine. This mummy bag achieves a phenomenal light weight through its 850+ down insulation, the loftiest down available on the market. Western Mountaineering wrapped up this ultralight insulation with a water-resistant ripstop material, which Western Mountaineering claims is the lightest downproof fabric out there. The shell's water-resistance helps the insulation retain its loft, and warmth, in moisture-riddled environments.

Western Mountaineering's critical thought to the smallest details makes the Summerlite a long-lasting and very versatile choice. A differential cut places more fabric at the lining to ensure maximum loft inside the bag, and continuous baffles allow you to shift the bag's down toward the top or bottom for more or less warmth. Hook-and-loop tabs let you pull the hood, draft tube, and draft collar farther or closer to you for customized coverage. Extra convenient features include full-length zippers on either side, a waterproofed stuff sack, and a storage sack with a large volume that helps the bag retain its loft overtime.

  • 32F degree lower limit rating
  • 850+ down insulation
  • Mummy shape
  • Water-resistant ripstop shell
  • Hood, draft collar, and draft tubes with hook-and-loop tabs
  • Full-length zipper on left or right side
  • Differential cut with continuous baffles
  • Stuff and storage sacks included
  • Item #WES000F

100% nylon ripstop (20D), DWR coating
850+ fill down
full-length, left/right
Max User Height
5ft 6in, 6 ft, 6ft 6in
Shoulder Circumference
[5ft 6in] 59 in, [6ft] 59 in, [6ft 6in] 60 in
Hip Circumference
[5ft 6in] 51 in, [6ft] 51 in, [6ft 6in] 52 in
Foot Circumference
[5ft 6in] 38 in, [6ft] 38 in, [6ft 6in] 38 in
Bag Length
5 ft 6 in, 6 ft, 6 ft 6 in
Draft Tube
yes, insulated
Fill Weight
[5ft 6in] 8 oz, [6ft] 9 oz, [6ft 6in] 10 oz
32 F
European Norm Comfort Rating
European Norm Lower Limit Rating
Storage Sack
yes, large volume
Stuff Sack
yes, urethane coated waterproofing
Stuff Size
[5ft 6in] 6 x 10 in, [6ft] 6 x 12 in, [6ft 6in] 6 x 12 in
Claimed Weight
[5ft 6in] 1 lb 2 oz, [6ft] 1 lb 3 oz, [6ft 6in] 1 lb 5 oz
Recommended Use
backpacking, alpine
Manufacturer Warranty

Tech Specs

What do you think about this product?


>Rating: 5

Excellent light weight bag

I've used it several times
True to size
Size Bought
5` 8"
150 lbs

I've used this sleeping bag in the Citico Creek Wilderness (May, 3 days/2 nights) and in the Wind River Mountains (August, 6 days/5 nights). I love it. It was comfortable during my May trip, when nighttime temps were in the 50s and 60s, and kept me warm in the Winds, where we had a couple of nights below freezing. It only weights 21 oz with the stuff sack, which is 20 oz lighter than my previous 800-fill bag.

>Rating: 5

Expensive but worth it!

I've used it once or twice and have initial impressions

I hate to be cold but I need to keep my pack weight to a minimum. I frequently backpack in the desert southwest where nighttime temps range from sub-freezing to 50+ degrees, so I want a lightweight bag that keeps me comfortable throughout that range. I've been using a terrific 30-degree synthetic bag for many years but it started to wear out at the same time I got tired of carrying all that weight. The Summerlite seems to be the answer! I'm saving almost a pound of weight and gaining a full-length, bi-directional zipper. This zipper allows me to unzip from the bottom if my legs get too warm, and makes it easier to dress/undress in the bag when it's chilly. I LOVE that there are 3 sizes -- I'm a 5'6" woman, and the 5'6" bag is perfect, not too small -- so I don't have to size up and carry even a single additional ounce! Thus far I've used this bag just once, on a 10-day, off-trail, North Rim Grand Canyon backpack. Conserving weight was crucial and the temperature range was crazy, but even tho I'm a cold sleeper this bag kept me happy throughout. I only wish the bag's outer fabric was less silky/slippery because I sometimes slid off my sleeping pad during the night! Pros: 1) amazingly low weight; 2) full-length/bidirectional zipper ; 3) choice of left/right zipper; 4) true to size; 5) choice of 3 bag lengths; 6) great warmth-to-weight ratio; 7) roomy inside even tho it's mummy shaped. Cons: 1) if you're a side sleeper the upper zipper corner will dangle in your face and be slightly annoying; 2) the outer fabric is SO slippery you might slide off your sleeping pad; 3) price. Overall I really like this bag, I'm looking forward to many comfortable future backcountry nights, and I'm very happy with my purchase!

>Rating: 5

Lives up to its reputation

I've used it several times

I picked up a Summerlite after having a couple too many cold and drafty nights with quilts. Quilts are fantastic for dropping weight in warmer seasons but finicky and untrustworthy (in my opinion) in the colder months. I just couldn't get a fully sealed, draftless nights sleep without waking every few hours to readjust straps. Enter the Summerlite. This thing weighs less than the same temp rated premium quality quilt I own and its toasty! Super happy with the feel and craftsmanship of this bag. Haven't had any down loss. Differential cut and continuous baffles mean this is a warmth machine for being a summer bag. A trick to increase the warmth of it is to grab bottom of it at the zipper and shake/pet the down towards the other side or top of the bag. This will leave a cold spot at your back but that can be mitigated by using a decently rated inflatable pad - R3 or higher.

>Rating: 5

A thru-hiking standard

I've put it through the wringer

This sleeping bag is perfect for long distance summer trips, where weight is a priority as much as reliability and warmth. I used it north of Mount Rodgers in Virginia on my AT thru-hike, and it was perfect. I am 5'11" 165 and the 6 ft length was perfect. If I were any taller I would definitely needed to size up. After my thru hike and countless shorter trips, I washed the bag with gear aid down soap using western mountaineering's guidelines and it was good as new. It was strapped to my handle bars on a 2800 miles bike-packing trip down the continental divide, and again was the perfect tool for the job. This bags rating is definitely accurate. I would not want to be using this bag when it is below freezing, but down to 35 degrees or so I always sleep comfortably.

Excellent review! Thank you! You have enviable adventures, Elliot! Enjoy your Western bag! Happy Trails - Leta Western Mountaineering Rep


What's the weight of this sleeping bag??


Does this come with a compression sack?

Hey Megan, they come with a stuff sack and storage bag but do not come with a compression sack.


Any idea when this bag in 6ft will be back in stock?

Hey TG, Unfortunately as of right now we don't have any more of this model ordered to come in, sorry about that!