One Man's Trash is Another Man's Treasure.

Don't let the Klymit KSB 20 Down Sleeping Bag's trash bag silhouette fool you into thinking that it's anything but a treasure. The KSB weighs in at 2lb 12oz and touts a budget-friendly price tag despite its technical features and lightweight constitution. A 20-degree temperature rating makes the bag ideal for three-season adventures when temperatures are cool. Stretch baffles provide unencumbered mobility, so you're able move around in your sleep or snooze on your side without your sleeping bag restricting your movement. A cozy lining offers a silk-inspired feel and prevents the buildup of moisture, while the 650-fill duck down provides lofted warmth in the face of cool temperatures. A draft collar bolsters your defense against cold air, and the half-moon footbox retains warmth better than conventional footboxes.

  • A 20-degree sleeping bag for three-season snoozing
  • Lightweight design is ideal for backpacking or camping
  • 650-fill maintains loft and is suitable for dry climates
  • DWR treatment fends off moisture and light precipitation
  • Stash pocket is ideal for headlamp, phone, or wallet
  • Stretch baffling provides an adaptive fit
  • Reviews
  • Q & A

Game changing

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

This review is going to incorporate my overall enthusiasm for all of Klymit's offerings. As an avid bikepacker and backpacker I'm no stranger to trying to save weight and space in my packs so I can enjoy the journey at hand without sacrificing on comfort . Klymit has a number of products, mainly sleeping bags and pads, that pack down small, are lightweight, and are priced such that you will still be able to afford that time off of work for those extended trips.
This bag is no exception to Klymit's above formula. I especially appreciated the freedom of movement due to it's built in elasticity.; et it still retained that warmth and snuggly-ness we're all after in a mummy bag..

Super cool!!!

very comfortable, reasonable weight

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

I spent a couple nights in this bag and have initial impressions to share.

First off, this bag is incredibly comfortable. I am used to a synthetic bag so the down was a nice change of pace. I get cold somewhat easily while sleeping and in the low 30's I was warm with minimal clothing.

The bag packs down pretty small when packed and expands nicely once it's out. If I were to purchase this bag, I would pair it with a compression sack to get the volume down even further.

At 6'2.5" the bag was long enough for me, which is not always the case with "normal" length sleeping bags.


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

It is very light and warm.
3 season sleeping bag is very suitable for me.


    This bag is very compact, which is what i was looking for in a backpacking sleeping bag. It also is very comfortable, this sleeping bag allows me to stretch out my legs unlike most sleeping bags.

    Warmth and Freedom in one

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

    Before this bag you could buy a mummy for warmth or a more square bag for leg freedom. with Kymit's stretch baffling you can now have both! You can also bring the foot box in if you're not tall enough to fill the whole bad. Minimizing air space is what will keep you warm when you're sleeping. I am so stoked to get out and use this bag even more.

    Initial impressions!

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

    The first thing that caught my eye was the stretch baffling. The bag is shaped like a traditional mummy bag, but the seams of the baffles are elastic allowing for movement and a customized fit. Killer design!

    Initial Impressions-- Money!!

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

    I start this review off with a disclaimer***
    I have only used this bag for one weekend camping trip so far, and the lowest temp it got to was mid 40's. I won't be able to speak for how well it performs in cold yet

    The bag has a great feel for the price and comes with a stuff sack and loose storage sack. That is a plus for users who want the loft to last. It has elastic baffles, which I am skeptical of at this early time, but seem pretty cool. They add a little scratchiness to the overall bag feel when you are inside. but if you are claustrophobic or hate mummy bags, this would be an awesome feature for you. You legit can spread out if you need, and when you don't, the elastic brings the bag back close to your body to keep you warm. I am still able to get the zipper snagged, and I wish it came with a left orientation, but the zipper really is an improvement from Marmot, Big Agnes, and other brands of bags I have used. I needed to have the bag fully unzipped for most the night that was in the 40's, but it has a nice draft collar and baffles around the zippers to keep things warm.

    The bag is a little heavy for a down backpacking bag, but if you can get it quite small. I bought a Sea to Summit dry compression bag (size M 14L) for it, and can get it down to a pretty tiny nugget with minimal effort. I will sacrifice a little weight for a nice bag at this price though. I am not backpacking hundreds of miles a year and commonly car camp.

    For the price, the initial quality and full lineup of features seems worth it. I will swing back if things change and also try to add a pic of it compressed.

    Initial impressions good!

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

    I was surprised with this bag. Great features such as a truly no-snag zipper (finally), baffles along the entire length of the zipper to keep out drafts, a draft collar with stowable velcro closures (no scratch on your skin), and stuff sack plus loose storage mesh bag. A little on the heavy side for a backpacking bag (~3lbs), but seems to be quite warm. Looking forward to testing it in the elements!

    Hopefully it will serve you well this summer out in Hawaii.