Klymit KSB 20˚ Oversized Down Sleeping Bag review

Why is it that sleeping bags are one-size-fits-all? People come in all body shapes and sizes, but sleeping bags generally are all the same length and width. But that all changes with the introduction of the Klymit KSB 20˚ Oversized Down Sleeping Bag. It’s the first sleeping bag that I’m aware of that you can actually adjust the size to fit your height, which means you don’t have to use your body heat to warm up a ton of empty space.

Review of the new Klymit KSB 20˚ Oversized Down Sleeping Bag. (Photo: Jared Hargrave – UtahOutside.com)

I’ve tested out the KSB 20˚ Oversized Down Sleeping Bag on a recent backpacking trip in Southern Utah, and have a few thoughts about how it works. But first the details:

The Klymit 20˚ Oversized Down Sleeping Bag features:

  • 20˚ Temperature Rating
  • 650 fill with White Duck Down
  • Stretch Baffles for added comfort
  • Anti-Snag Zipper
  • Perfect Fit Length Locks that shorten bag up to 15″
  • Weighs 3.1 lbs

Out of the box, the KSB 20˚ Oversized Down Sleeping Bag seems like any other down sack. That is until I get inside it and roll around a bit. The stretch baffles make a huge difference in being able to toss and turn without feeling constricted. I also like to use my sleeping bag to get changed inside of where there is no privacy (think yurt trips) and those stretch baffles will make it much easier to change underwear or pants inside the bag.

The KSB 20˚ Oversized Down Sleeping Bag stretch baffles let you toss and turn at night without constriction. (Photo: Jared Hargrave – UtahOutside.com)

Sleeping in the bag, I was very comfortable in overnight temperatures in the 40s on a backpacking trip through Buckskin Gulch. In fact, the bag was a bit too warm. While I have not been able to test it in below-freezing temperatures, based on how thick the down fill feels, I’m confident that I would be warm down to 20 degrees.

Other features like a draft collar, over-stuffed foot box, and insulated mummy hood round out the bag and are pretty much standard for sleeping bags these days. But what really sets this sack apart from the rest is the Perfect Fit Length Locks. These are adjustable loops and toggles at the foot of the bag that you can use to reduce the length up to 15 inches, downsizing it to fit a 5’3″ person. That’s very cool.

The KSB 20˚ Oversized Down Sleeping features Perfect Fit Length Locks to shorten the bag to your height – up to 15″ or a 5’3″ person. (Photo: Jared Hargrave – UtahOutside.com)

I’m 6-foot even and didn’t feel the need to downsize during testing, but what if your short wife needs to use it? She could simply use the length locks to shorten the bag for a perfect fit. Plus, the overstuffed foot box means relief for those with chronically cold toes when camping during cold nights.

The sleeping bag is light enough for backpacking trips (though there are lighter options out there for weight weenies). But the KSB 20˚ Oversized Down Sleeping Bag is just the right weight to be an all-in-one bag for backpacking or car camping. On my trip I paired it with the Klymit Static V sleeping pad, Klymit Luxe Pillow, and Klymit V Sheet for what amounted to the ultimate in backpacking comfort.

The Klymit KSB 20˚ Oversized Down Sleeping has a temperature rating of 20-degrees. (Photo: Jared Hargrave – UtahOutside.com)

The Good: Stretch Baffles make this a comfortable bag for restless sleepers. Perfect Fit Length Locks let you size the bag to your height, light weight and warm.

The Bad: I don’t dig the nylon inner lining. I think it feels like plastic against bare skin. Best to wear base layers to bed in this bag.

Final Word: If you’re looking for a customizable sleeping bag that can be adjusted to fit your unique height that is also warm, comfortable and packed with thoughtful features, then the Klymit 20˚ Oversized Down Sleeping Bag is all you’ll need.

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