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Flex 15°F

24 reviews

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Fill

A blanket style 15 degree sleeping bag that will truly keep the cold out. The Katabatic attachment system, down filled collar, and draft blocking foot box closure guard you from the cold. When you need some ventilation, the zippered foot box allows you to completely open to a blanket. The options in between are endless, and create a truly flexible sleep system.

Overfill is available to add to this item.


INCLUDED

Free Shipping in the United States
Silnylon Stuff Sack
Organic Cotton Storage Sack
2mm Cords for attaching to your pad (comes with extra cord)
Webbing straps

  • Patented Pad Attachment System - Widely considered the best design on the market for preventing drafts. Offers unmatched versatility, comfort and efficiency in a quilt style sleeping bag. For more information view our Product Manual.

    Can Be Used Without a Sleeping Pad - Comes with removable webbing straps to be used without attaching to a sleeping pad. For more information view our Product Manual.

    Elastic Binding Around Bottom Opening - Elastic binding around the bottom opening prevents gaps and drafts at the sleeping pad.

    Differential Cut - A critical factor in quilt style bags with adjustable girth, differential cut allows for maximum loft from our premium down.

    Continuous Baffles - With continuous baffles the down can be manually moved as temperatures dictate for maximum versatility.

    Down Filled Collar - Our overstuffed collar fits comfortably against your neck to seal this critical area from drafts.

    Draft Blocking Foot Box Closure - When the temperature drops, and you need a closed foot box, our down-filled draft blocker and snap system fill the gaps, while allowing multiple venting options for warmer weather.

    Overstuffed Baffles over the Foot Section - Provides extra insulation over your feet to ensure toasty toes.

    Overfill Available: For more information or to order overfill click here.

    Shell imported. Designed, filled, finished and stringently inspected in Colorado.

    Included

    Free Shipping in the United States
    Silnylon Stuff Sack
    Organic Cotton Storage Sack
    2mm Cords for attaching to your pad (comes with extra pair of cord)
  • Specs Small Regular Long Regular Wide Long Wide
    Fits To 5'6" 6' 6'6" 6' 6'6"
    Fill Weight (ounces) 850fp 900fp 850fp 900fp 850fp 900fp 850fp 900fp 850fp 900fp
    17.1 15.9 18.2 16.9 19.7 18.3 19.8 18.4 21.4 19.9
    Total Weight (ounces) 25.3 24.1 26.8 25.5 29.0 27.6 29.1 27.7 31.1 29.6
    Loft Single Side 3.25" 3.25" 3.25" 3.25" 3.25"
    Shoulder Width 54 inches (Similar to 63" mummy bag) 54 inches (Similar to 63" mummy bag) 54 inches (Similar to 63" mummy bag) 58 inches (Similar to 67" mummy bag) 58 inches (Similar to 67" mummy bag)
    Hip Width 45 inches 45 inches 45 inches 49 inches 49 inches
    Foot Width 40 inches 40 inches 40 inches 44 inches 44 inches
    Packed Size 7 X 13.5 inches 9 Liters 7 X 13.5 inches 9 Liters 7 X 13.5 inches 9 Liters 9 X 15 inches 15.5 Liters 9 X 15 inches 15.5 Liters
    Due to variances in raw materials, finished weight my vary by +/- 5%

    Metric Specs
    Specs Small Regular Long Regular Wide Long Wide
    Fits To 167.5cm 183cm 198cm 183cm 198cm
    Fill Weight (grams) 850fp 900fp 850fp 900fp 850fp 900fp 850fp 900fp 850fp 900fp
    485 451 516 479 558 519 561 522 607 564
    Total Weight (grams) 717 683 760 723 822 782 825 785 882 839
    Loft Single Side 8.3cm 8.3cm 8.3cm 8.3cm 8.3cm
    Shoulder Width 137cm (Similar to 160cm mummy bag) 137cm (Similar to 160cm mummy bag) 137cm (Similar to 160cm mummy bag) 147cm (Similar to 170cm mummy bag) 147cm (Similar to 170cm mummy bag)
    Hip Width 119cm 119cm 119cm 130cm 130cm
    Foot Width 102cm 102cm 102cm 112cm 112cm
    Packed Size 18cm X 34cm 9 Liters 18cm X 34cm 9 Liters 18cm X 34cm 9 Liters 23cm X 38cm 15.5 Liters 23cm X 38cm 15.5 Liters
  • Responsibly Sourced Down

    Like many of our customers, we at Katabatic Gear are concerned with the environmental and animal welfare impact of our products. We are dedicated to a responsibly sourced, and very high quality product, just like our down supplier, Allied Feather and Down. They are certified through both the bluesign®and Responsible Down Standard®programs. Another reason we partner with Allied: we can offer our customers access to the Track My Down program. It allows our customers to learn everything there is to know about the down in their specific quilt. For more information, please follow these links to Allied’s Pledge, FAQ’s, and Track My Down pages.

    900 Fill Power Goose Down

    We use the highest quality 900 Fill Power goose down, offering the most loft and warmth for the least weight. Goose down has many advantages over synthetic insulations. In warm temperatures goose down allows heat to pass through, giving it a wider comfort range than synthetic insulation. The down can be intentionally moved around in its baffles, allowing you to adjust the amount of insulation based on conditions. Finally, synthetic insulation breaks down more quickly with use, losing loft and warmth. As a result a down filled product has a life span many times that of a synthetic filled product, making down a much better value. Our 900 Fill Power premium goose down is produced for us here in the U.S. by Allied Feather, and is available untreated or with HyperDRY™ water-resistant treatment.

    850 Fill Power Duck Down

    With all the benefits of down vs. synthetic, duck down is often cheaper than goose down, only due to the fact that it is more widely available. For years it was difficult to obtain duck down in a fill power greater than 700, which meant a heavier sleeping bag. Now that we can get responsibly sourced, high quality, 850 f.p. duck down, we are happy to be able to offer it to our customers. There are no quality, performance, or longevity sacrifices in buying a duck vs. goose product. One potential downside is that the natural animal odor that can be present in down products is more common to duck down than goose. This does not mean your duck down will necessarily have an odor, or that goose down will not. It varies from one lot of down to the next, and we’re told it is due to the birds’ diet. Some folks don’t notice any odor, while those more scent sensitive might, particularly if the bag is damp. As one customer put it, “Who cares! In a week or two it’s going to smell like MY odor.” Our 850 Fill Power premium duck down is also produced for us here in the U.S. by Allied Feather, and is offered with HyperDRY™ water-resistant treatment.

    HyperDRY™ Water-Resistant Down

    We are pleased to offer HyperDRY™ hydrophobic down. This down has been treated to provide additional resistance to unwanted moisture. In conjunction with our highly water-resistant shell materials, HyperDRY™ provides extra peace of mind, and dries faster than untreated down if it does get wet. Is this a miracle water-proofing that will allow you to sleep out in the rain or dunk your bag in water with wild abandon? No. Will it give you extra protection and help maintain loft in damp conditions? Absolutely! Our water-resistant down is bluesign® approved, so you can rest assured that it is safe for the environment and human health. Produced for us here in the U.S. by Allied Feather. Available in 900fp goose down and 850fp duck down.

    Pertex Quantum Y Fuse Eco Riptstop (.85 oz/yd)

    The best fabric you’ll find for the shell of an ultralight sleeping bag.
    1. Keeps your insulation drier: Best DWR we’ve tested
    2. Keeps your insulation loftier: Lightweight, soft, breathable, and downproof
    3. Keeps your quilt out of the landfill: Pertex Y Fuse technology extends the longevity of this already durable UL fabric, and also improves its highly downproof and water beading properties
    4. Reduces demand for raw materials: Eco version of Pertex Quantum is made from recycled yarns and maintains the fabric’s advanced performance qualities

    Pertex Quantum Tafeta (1.0 oz/yd)

    The softest fabric you’ll find for the liner of an ultralight sleeping bag. This Pertex Quantum plain weave makes for a silky soft liner fabric on the inside of our quilts. We get tons of customer feedback stating that it’s the most comfortable sleeping bag fabric to ever brush up against them – not as clammy or crinkly as other fabrics.
  • Quilt Style Sleeping Bag

    The idea behind a quilt style sleeping bag is to eliminate the insulation from the bottom of a conventional sleeping bag. Why? Insulation must have loft and trap air in order to be effective. Since any insulation beneath your body gets crushed, it is wasted. So why not leave the insulation (and the fabric and all that weight) out of the bottom of the bag? This is what a quilt style sleeping bag does, but it goes one step further.

    When a quilt style sleeping bag is designed well, versatility is significantly increased. Our patented pad attachment system and elasticized edging keep your body heat in and the cold drafts out. When conditions are warm, lay the quilt over you like a blanket and allow some ventilation. There are numerous variations in between, making our quilts comfortable in a much wider range of temperatures than a traditional sleeping bag. Another huge benefit of a well designed quilt: you can toss and turn and roll around without getting tangled up or rolling off your pad!


    Attachment System

    The backbone of our down quilt style sleeping bags is our patented Cord Clip attachment system. The beauty of this design is its simplicity. All our bags feature our Cord Clips, and come with 2mm cord for attaching the sleeping bag to the pad. Simply cinch the cords around the pad, and attach your bag! This system works easily with most sleeping pads.

    Our Cord Clips feature two attachment options for maximum versatility. The first attachment position allows the clip to slide freely on the cord. For warm weather this gives you the most freedom of movement. As the temperature drops, clipping into the second position allows you to lock the bag in place on the cord. In this position you can control the girth of the bag, and are able to set the bag to overlap your pad to lock out drafts. Even with the Cord Clip in this position, adjustment along the cord is easily accomplished by lifting the Cord Clip vertically. With the Cord Clip held vertically it slides easily along the cord. Returning the clip to its horizontal position locks the Cord Clip in place along the cord. This allows you to adjust the interior volume of the sleeping bag, as well as adjust the bags position on top of the sleeping pad. Secondary clips help seal out drafts when the temperature really drops. This unique design offers significant advantages. The ability to attach your sleeping bag to the top of the pad, as well as the ability to easily adjust the girth/volume of the bag, allows you to optimize the position of the bag depending on your sleep position, and the level of warmth you need from your bag. In warm weather you have much more room than you are used to in a mummy bag. In cold weather just close the bag in around you for maximum warmth.

    We have engineered our Cord Clips to be strong and durable, while being thin and unobtrusive. Even if you have your sleeping bag pulled in under your body, our Cord Clips are designed to lie flat and to be unnoticeable. Our Cord Clip system is fast, simple and easy to use. Attach the cords around your pad before you leave home. Then just lay out your pad, clip your bag on to it, adjust as needed, and sleep!


    Differential Cut

    Our sleeping bags feature a substantial differential cut, which is highly beneficial in a quilt style sleeping bag with adjustable girth. The shell fabric is cut wider than the liner fabric, making the circumference of the shell larger than that of the liner. This means that when you start to draw the bag in on a cold night, you’re less likely to crush the insulation creating cold spots. This is a detail that many manufacturers overlook, but we think it’s one of the keys to a more effective quilt, and a warmer night’s sleep.

    Continuous Baffles

    The baffles in our quilt style sleeping bags are continuous from one side to the other. This allows down to be moved to the top, sides, or bottom of the quilt when temperatures fluctuate. On warm nights, you can move the down to the sides or bottom, allowing a little heat to escape. On cold nights, move more down to the top of the quilt to keep that body heat in. This works particularly well when the quilt is attached to your pad, because the same part of the bag is always on top, no matter how you roll, toss, or turn.

    Down Collar

    Our quilts feature an overstuffed down collar around the neck opening. This critical feature means you can comfortably seal warmth inside your sleeping bag without choking yourself with a scrawny drawcord.

    Versatile Foot Box

    Our zippered foot box features a versatile system that offers numerous options for ventilation, or complete warmth. Along with the zipper, the drawstring, snap, and down-filled draft blocker allow you to decide whether you lock out the cold, allow in a little fresh air, or completely open up to a blanket.


    Separate Hood

    When you think about it, a separate hood really makes sense. If you toss and turn, your quilt stays in place on top of your pad, and your hood stays in place on top of your head. You are not going to wake up in the middle of the night, lost somewhere in your mummy bag, wondering which way leads out.

    Do you need a hood? Here is what we have found: if temperatures are going to be near the temperature rating of your quilt, then you will probably need a hood. If the forecast calls for warmer weather, leave the hood at home, and just wear a warm hat to bed. Looking to save weight and get the most use out of minimal gear? Take a warm jacket with a hood, and wear that to bed if the weather is cold. You keep your head warm, and add extra warmth to your entire sleep system.

    Bivy Sack in Conjunction with Quilt

    Our water resistant, highly breathable bivy sacks are designed for use under a tarp or floorless shelter. These bivy sacks provide a waterproof floor, full bug protection, and a water resistant upper to protect your quilt from spray and mist. Our bivy sacks are designed to integrate perfectly with our quilts. Simply attach your pad to the floor of the bivy through the pad attachment cords, then clip your quilt on to these same cords. Your pad stays in place in the bivy; your bag stays in place on the pad. Leave your pad attached to the bivy and setup the next night is a breeze.

    The System as a Whole

    What does it all mean? Set up and adjustment are quick and simple. The quilt stays in place on top of your pad. The hood stays in place on your head. All our components are designed to work together, but the system is also designed to make the most of gear you already have. Our quilts can be partnered with almost any sleeping pad you like. Use your hooded jacket or a warm hat on cold nights. Use the tent you already own, or partner our bivy with your tarp. All in all, you are making the most out of every piece of gear, while resting comfortably no matter what position you sleep in.

    The bottom line? Our sleep system is much more versatile than any conventional sleeping bag, and it weighs a lot less!
Customer Reviews
5.0 Based on 24 Reviews
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Filter Reviews:
    L
    09/18/2020
    Laurie
    United States United States
    15 Degree Flex Quilt 850 LOVE IT!!

    I had to go back to this site to say this is the most amazing quilt ever! I was hesitant about buying a quilt over a sleeping bag. I am 5'5" and 125# and in my "50s". I bought the 5'6" which was perfect. The fluffy collar snaps to keep around your neck and the foot cinch can be loosened or tightened & snapped closed. The half zipper at the foot is perfect because you can still roll on your side & bend your legs without your feet coming uncovered. I tried the quilt out at home in 30 degree weather and than in August when I hiked the PCT through Oregon. It kept me comfortable in all temperatures. I did wear warmer "pajamas" in the 30 degree weather. I used the straps around my Kylmit Pad (R rating of 4) in the cold weather, but never used them on my hike. There were a couple nights of about 40 that I had to tuck the quilt around me, but I never got cold. The best thing about the quilt is it made me feel comfortable in the wilderness. It was so cozy & warm and it even blocked out the sound of a couple of horrendous wind storms!

    M
    09/05/2020
    mwebb96
    -

    I will never return to a traditional mummy bag. This quilt is very toasty and nonrestrictive, perfect for cold and restless sleepers.

    Z
    08/11/2020
    Zen
    -

    Only been out on one trip with it so far ' 4 days in Holy Cross ' but so far, it's been fantastic. So compact! (get a good silnylon compression sack). So nice and light to carry. And yet so versatile as well. I'm 5'9_, but I got the 6'6_ wide / 900fp HyperDRY because I love to use my quilts wide open so I can freely move about. And the extra coverage is totally worth it IMO. Will the HyperDRY live up to it's name? Time will tell. But I thought it was worth it. You really can't be too careful with down. Those nights in Holy Cross were warm (been a hot, dry summer in Colorado). At bedtime it was probably still 55 degrees out. I worried I might be too warm in a brand new 15 degree rated fully lofted quilt. But with a loose drape of the quilt, ditching my hat, and hanging my feet out the bottom, I found that the quilt actually regulated the temperature quite well. And unlike other bags I've had, the Pertex fabrics of the Katabatic shell breathed nicely & moisture buildup on the fabric was not a problem, nor did I feel clammy. By morning, the temp had maybe dropped to the high 30s. So I haven't gotten a chance to really push the temp rating yet. But with the quilt still wide open, the addition of a light fleece hat on the head, and my feet tucked back under, in the high 30s, I was so warm and cozy and comfortable I never wanted to get up. My highest quality bedding now lives in my tent. As for longevity, that of course remains to be seen. But the detail of the product is superb in every respect. It's also got some great little features that some of the other guys miss. Being able to close the footbox without leaving a drafty hole, for example. Katabatic fixed this by adding an additional snap. And it works great. And all the snaps have also been reinforces with swatches of much thicker fabric to eliminate the possibility of tears due to fabric fatigue in those high stress areas down the road. I love a company to pays careful attention to it's products (and it's customers). I also love that I was able to keep my money in Colorado, buying from a small specialty shop. Well done, Katabatic. So far, it's fantastic.

    J
    08/11/2020
    Jerry
    -

    This is my absolute favorite bag among a long list of bags I've owned over many, many years. It is so versatile. I have replaced two bags of overlapping temperature ranges with it.

    D
    07/15/2020
    dseidman
    -

    In a decade of backpacking this is the first time I've been truly comfortable, using the lightest bag I've ever owned. I have the 10 degree long version with no overstuff. I'm 6_ and I'm glad I got the long. Those extra few inches make a big difference in being able to pull the draft collar tighter around my shoulders and neck. The 10 degree bag kept me toasty warm on a windy night that got down to about freezing, paired with a 10 degree torso length underquilt in my hammock. In warmer weather I've been able to easily adjust the tightness of the collar to regulate temperature. I could not be happier with this purchase.