The sheet is sized to fit your mattress and the quilt is sized to fit you.
Locate your height on the ruler below to see which size quilt and sheet/mattress we recommend. Ideally, you'll want to fall somewhere in the middle of the range. If you find yourself in the yellow, you'll probably want to size up for the most comfortable fit.The chart below is based on the average weight for each height. Also note that if you are an "active" or "wide" sleeper (i.e. someone that moves around a lot), you may want to consider sizing up to allow yourself more space to sleep naturally.
When in doubt, size up. Unlike mummy bags, there is no thermal disadvantage to a larger size Zenbivy because it is always free to wrap snuggly around you.Bigger is always more comfortable and just as warm.
Questions? We're happy to help. Let us know your height, weight, and general sleep style and we'll help you find the right size for you.
The sheet is sized to fit your mattress, whether it's one of ours or your current mattress. Our sheets fit both rectangular and tapered mattresses.Note on 4-inch mattresses:our sheets will fit 4-inch thick mattresses withroundedsides, but they do not work on 3D vertical side wall mattresses that are 4" or greater.
DESIGN UPDATE: We are currently in the process of transitioning our fitted sheets over to an adjustable design to accommodate different mattress lengths. These sheets will be named 20", 25", and 30".
20" sheets will fit mattresses up to 20" x 72" x 3.5" 25" sheets will fit mattresses up to 26" x 78" x 3.5" (including 25x72 mattresses!) 30" sheets will fit mattresses up to 30" x 80" x 3.5"
See measurements for max shoulder/hip/foot circumference of each size Bed, along with the dimensions of just the quilt itself.
Dry Sack Sizing
Find your Bed on the image below and match it to its recommended Dry Sack size. Don't worry, with the recommended size there will still be room to throw in your Zenbivy pillow and even a down jacket.You can expect your Bed to compress down to abouthalfthe size of its recommended Dry Sack. (Ex: 7L compresses down to 3-4L, 10L down to 5L, etc)
NOTE: For help with sheet sizing, please see the Specs + Materials tab
You don't have to choose between an ultralight pack or comfort at camp—the Light Bed gives you the best of both worlds. Our 2-piece sleeping bag combines the warmth and draft-free performance of a mummy bag with the luxurious comfort of a backpacking quilt. It's built to feel like your bed at home with a sheet below you and a quilt above so you can get a comfortable, natural night's sleep outdoors without the constriction of a mummy bag.
We've refined every aspect to save weight including using performance fabrics, high-quality down, and a unique ultra-secure hook and loop system to add versatility to the setup. We built the Light Bed for performance so you can go further outdoors in comfort.
The Light Bed 10° is WARM. It’s built for colder sleepers and those pushing the boundaries of “3-season”.
The Light Bed 10° includes the Light Quilt 10°, Light Sheet 10°, and an extra-large mesh bag for long-term storage. (Mattress, pillow, and compression sold separately)
Zipper-less Configuration — Our Light Quilts are offered in two styles: Fast Footbox™ or Convertible Footbox. The Fast Footbox™ is our simplest, lightest, and quickest. With a single clip and minimal fuss, it easily converts from warm “mummy mode” to spacious “wide mode”. In addition to both mummy and wide modes, our Convertible Footbox also unclips to lay completely flat. The Convertible Footbox provides maximum versatility in warmer temperatures and when used with accessories.
Comfortably Light Fabrics — You'll find that most down backpacking quilt makers shed weight by using thin, clingy 10d fabrics. We found more clever ways to ditch ounces while keeping the fabric a very smooth, comfy, and durable 20d. 20d fabrics are much softer than traditional ultralight tech fabrics while being only a fraction heavier. Definitely worth it!
The Kylie-curve™ — The patent-pending Kylie-curve™ is a 3/4 length baffle-backed drawstring on the top edge of our quilts. Unlike traditional backpacking quilts that have a drawstring spanning the entire width, the shortened cord length on the Zenbivy quilt cinches only the center portion. It softly seals around your neck while leaving either edge loose to drape at your sides or tuck up into the fitted sheet's hood to block drafts.
Quality Insulation — The Light Bed is filled with premium 800 fill-power HyperDRY™ down. This down uses a natural wax-based compound to make it water resistant. It is durable, fluorocarbon-free, and RDS (Responsible Down Standard) compliant.
Thermally-mapped Baffles — We designed our quilts to maximize thermal efficiency, distributing down to provide the most warmth where it’s needed. Smaller baffles minimize down-shift, vertical baffles around the upper body prevent down from sliding, and horizontal baffles on the top of the foot box keep down from shifting with foot movement.
Roomy Integrated Hood — Built for all sleep positions, the Light Sheet features a wide rectangular hood that provides extra space and restriction-free warmth around your head and arms. The hood also acts as a cubby to keep your camp pillow from wandering away in the middle of the night!
Light & Compact — Starting at just 1 lb 12 oz and compressing down to about 3-4L in size, the ultra-compact Light Bed is the best choice if you're an avid backpacker looking for comfort at the lowest possible weight and bulk.
All Light Quilts are compatible with all Light Sheets regardless of size. The quilt is sized to fit you, the sheet is sized to fit your mattress. See our full size guide for more information.
Weight (Quilt w/ Fast Footbox™) Regular: 2 lb (0.91 kg) Large: 2 lb 5 oz (1.05 kg) XL: 2 lb 10 oz (1.19 kg)
Weight (Quilt w/ Convertible Footbox) Regular: 2 lb 1 oz (0.93 kg) Large: 2 lb 6 oz (1.08 kg) XL: 2 lb 11 oz (1.22 kg)
Weight (Light Sheets) 20": 9 oz (0.26 kg) 25": 10 oz (0.28 kg) 30": 11 oz (0.31 kg)
Fits on mattresses UP TO... 20": 20” x 72” x 3.5"+ (51 x 183 x 9+ cm) 25": 26” x 78” x 3.5"+ (66 x 198 x 9+ cm) 30": 30" x 80" x 3.5"+ (76 x 203 x 9+ cm) The 25" sheet will fit both 25x72 and 25x77 mattresses. See our size guide for specifics on sheet/mattress sizing
Flat Quilt Dimensions* Regular: 78” x 54” (198 x 137cm) Large: 86” x 58” (218 x 147cm) XL: 90” x 64” (229 x 163cm) *Only Convertible Footbox quilts go completely flat. Please note that the listed quilt dimensions are for the cut fabric. Filled, lofted quilts will be several inches smaller in both length and width.
Recommended Dry Sack Size The 10L Dry Sack will fit all sizes of the Light Bed 10°. You can expect your Light Bed to compress down to about half the size, or 5-6L. Dry Sacks are sold separately.
The Fast Footbox™ is our simplest, lightest, and quickest. With a single clip and minimal fuss, it easily converts from warm “mummy mode” to spacious “wide mode”.
In addition to both mummy and wide modes, our Convertible Footbox also unclips to lay completely flat. The Convertible Footbox provides maximum versatility in warmer temperatures and when used with accessories.
Light Quilt Features
Hook & Loop Attachments
The Light Quilt uses a series of color-coded hooks and loops to form the footbox and attach the quilt to the sheet. This not only sheds the weight of heavy zippers, but gives you more versatility in how you choose to clip it!
The patent-pending Kylie-curve™ is a 3/4 length baffle-backed drawstring on the top edge of our quilts. Unlike traditional backpacking quilts that have a drawstring spanning the entire width, the shortened cord length on the Zenbivy quilt cinches only the center portion. It softly seals around your neck while leaving either edge loose to drape at your sides or tuck up into the fitted sheet's hood to block drafts.
Smooth Fabrics & Quality Down
No thin, clingy 10d fabrics here. We found more clever ways to ditch ounces while keeping the fabric a very smooth, comfy, and durable 20d.
The Light Quilts use top-shelf 800 fill-power HyperDRY™ down, using a natural wax-based compound to make it water resistant. It is durable, fluorocarbon-free, and RDS (Responsible Down Standard) compliant.
Light Sheet Features
By clipping the Light Quilt to the hinged “wings” of the Light Sheet, it's free to get wider where and when you need it to while preventing any possible drafts from the sides as you move. Then, just as instantly, the quilt "settles" to wrap snuggly around you.
Large Insulated Hood
Tuck in under the sheet's large hood to keep your head warm on cold nights. It's roomy and wide enough to fit the arms of stomach sleepers as well! The integrated hood doubles as a cubby to keep your camp pillow from wandering off in the middle of the night.
20d Nylon Taffeta Body
The Light Sheets are made with 20d nylon taffeta. This 20d fabric is buttery-soft and smooth against your skin. It's more comfortable than sleeping directly on the mattress and, as a bonus, it helps to keep your mattress cleaner for longer!
Our sheets are designed to fit most standard size mattresses on the market—both rectangular AND tapered styles! They are available in 20", 25", and 30" sizes. See our full size guide for specifics on sheet/mattress sizing.
I sleep as good in the backcountry as I do at home (maybe better).
As a side and stomach sleeper that rolls frequently, the Zen Bivy made all the difference for me. I could never get a good night sleep in a mummy bag. Now I sleep better than I ever have. Just got done with a 6-day trek in 50 degree temps and was a little worried about the 10 degree bag being too hot. But with a fast sheet (instead of my 10 degree sheet), opening the convertible footbox and unhooking one side of the quilt, I was able to easily regulate temperature in a way that is nearly impossible in a mummy bag. Any in colder temps it is just awesome with the 10 degree sheet. Very happy with the Zen Bivy.
My wife and I paired our 10 degree light beds with Big Agnes Rapide SL Mattresses. We bought them in March, and we have over 20 nights sleeping on them. In one word - Wow!
I've had all kinds of sleeping bags over fifty years. Most of those years were spent sleeping on either a foam mat or the self-inflatable Thermarest pad with plenty of couches mixed in. The only times I was really comfortable sleeping was when I was in a hammock. The rest of the time I slept OK and just accepted that camping meant that you're always less comfortable when trying to sleep.
There's no doubt about it - modern air mattresses are a big part of the comfort in this system. A traditional sleeping bag on a modern air mattress is a big improvement. However, the Light Bed combined with a quality air mattress rivals the comfort of sleeping in some of the best beds, even in terrible weather conditions.
With the air mattress/pad, you don't have any pressure points to cause aches and pains. With the innovative quilt, you can sleep in any position and change positions without a limit and without sliding off of your sleep pad. It's hard to explain how a person who is used to sleeping on a king sized select comfort bed is just as comfortable in this combination, but I am. It's to the point that when I visit someone overnight, if there are any limits on bed space, I'm the first to volunteer to sleep on the floor in this system. In truth, I prefer sleeping in this system to most guest beds - but sometimes people find it weird when you would rather sleep on the floor in a sleeping bag instead of on their bed.
The big challenge for most people is choosing between the 25 and 10 degree versions. My wife and I went with the 10 degree bags because she tends to sleep cold. For her the 10 degree quilt and quilt liner was the absolute correct choice. She has stayed warm and comfortable on nights that dipped down to the low 20s in the rain and wind, and had no trouble, when in the past she would have issues sleeping in a 0 degree bag on a traditional pad. I sleep warmer, so I'd like a little less weight and a little less bulk on typical warmer nights. Having said that, I still sleep comfortably because it doesn't take long to figure out how to adjust the different loops and catches to modify the bed for comfort in practically any temperature.
As it is, after a few nights sleeping with this system, it's pretty easy to stay comfortable and avoid sweating by tweaking connection points and the convertible foot box. I really love how versatile this system is and expect to get years of regular use from it.
Now I'm excitedly waiting for the new quilt liners. I think they will add more customizability to different temperatures while helping keep the quilt clean during most use cases.
This in conjunction with the light sheet 10° is a game changer for the side and stomach sleepers. I love the versatility of the quilt which is why we went with the light set for the clips instead of zippers. There are so many options. I started with the convertible footbox cinched but I actually enjoy it in wide mode or fully open on warmer days. I won't be going back to a regular sleeping bag anytime soon.