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Great for a cave in the snow

    Great for a cave in the snow. I was near the summit and have no way to go douwn to the camp. use it in a "snow cave" and it save my life!!!!!

    Bivy on Whitney near Trail camp

    Bivy on Whitney near Trail camp

    I took the BD winter bivy out for a test run with my Marmot 40degF on Whitney last weekend and with my Mountain Hardwear 0degF near New Army Pass two weekends before; both times I used a Therm-a-rest NeoAir. While the bivy is nice and lightweight, it doesn't breathe perfectly and is a little tight with the air mattress and 0degF bag; otherwise it is perfect.

    I have had many ruined campouts with flooded...

    I have had many ruined campouts with flooded tents or very rainy conditoins. Would this bag be considered "Waterproof"? And I would also like to know if it would be good for heavy rain.

    Best Answer

    I have never used Polyester Ripstop fabric but they claim that it is waterproof, the seams are not sealed so i would do that myself if i was going to be using it in the rain. Get it try it out and if it doesnt work the Goat has a 30+ year return policy so your good!



      I used this in the North Cascades in February during a snowstorm up 6000ft and it was absolutely horrible. Not waterproof, not windproof, and should NOT be considered a "winter" bivy, let alone a bivy at all. It's thinner than tent material and super light-weight, but that is not always a good thing. Get another bivy, not this one.


      One advice: Seal its seams

        This Bivy sack does what it's meant to, nothing more. It is amazingly light and is designed to keep you warm and dry while sleeping mostly ABOVE the snow line. i.e. when it is cold and snowy and rain is not your biggest concern. The biggest advantage is its highly breathable fabric (my experience, I see some controversy here), which is priceless as I use a down sleeping bag. Its disadvantage are the almost "transparent to water" seams, hence I strongly recommend sealing the seams for true water resistant (NOT waterproofness) If your are after water proof, Gore-Tex, and the like, this is not your sack.


        Very light but no good

          I agree with other reviewers. This thing doesn't breathe. The inside was wet from condensation after 1 night in a snow cave. Talked to an R&D guy for Kiwi company Macpac who tested Epic fabric way before BD used it. The verdict was "not the most breathable fabric around..or the most waterproof ... Ok for N America dry snow but not kiwi wet snow."

          I am thinking about getting a big agnes 0...

          I am thinking about getting a big agnes 0 degree and combining it with a bivy for winter camping in the rockies of colorado. I am an avid AT skier but am wanting to get into longer trips. Would this bag/bivy idea be ok for the cold winter high country? How much warmth does a bivy add?

          This bivy would be fine for your intended purpose. As far as warmth is concerned, maybe five degrees but it will keep the elements out & this is the most important factor.

          I think the ground is really cold in the winter and I cant imagine this thing actually keeping anyone much warm other than a bit of wind chill and water, but I wouldn't expect much more than 3 degree's advantage. They should have it engineered and tested, with specs for those who'll actually be using this type of gear to survive out there.

          is this a good bivy that will protect...

          is this a good bivy that will protect against the elements when raining and will hold a person and a sleeping bag? Would this be an okay bivy for ultralight weeklong backpacking trips?

          Best Answer

          My personal experience is that it is superlight and pretty waterproof. I have spent a few nights in light rain in it and been dry. I would recommend putting the seamsealer that comes with it. If you want something totally waterproof I could recommend the It is fully waterproof. The Winter bivy is superlight and compact but isn't designed for week long rainy backpacking trips. I can understand any apprehension on your part. It's like being on a rope for the first time. Trust your gear. It will perform just fine.

          is there no-see-um mesh on the opening?

          is there no-see-um mesh on the opening?

          no there is none.There is a mesh panel @ your face for ventilation.


          Lightweight, simple, inexpensive

            I bought this as an emergency bivy for backcountry skiing. It is a great little bag, once I'd consider taking with me on a trek where I might have to do an emergency sleep out overnight. Very small and light, not many extras, no zippers, but certainly a great product for its design, also a nice way to increase sleeping bag warmth rating.


            Cheap, Water resistant, packs small, light

              The zipper can break and its not waterproof but great for emergencies or nights out in the open when all you need to do is keep off the dew.


              Misery in the Columbia's

                This item performed terribly for me. I used it on 2 overnight ski tours in the Columbia mountains of BC - both times getting my sleeping bag soaked from condensation. I also used it for an overnight well below the snow line and above freezing temps, and it still filled with condensation. This thing does not breathe at all, regardless of temperature, inside or outside of a tent. It sucks, which is a shame as I am normally a huge fan of Black Diamond gear.


                Not for me

                  I was looking for a light, Bivy/Bag Cover mainly for emergencies but functional as a bag cover for wet nights out, or in a snow cave/shelter etc...Pros: simple, light, cheap$. Cons: Hard to get into and out of, strange/dorky zipper, not seam sealed, seemed cheaply designed and assembled. I also tried the Mountain Hardwear Conduit SL which was small (I'm 6'/200lb) and heavy. I returned both of them. I got/love/highly recommend the MontBell UL Wide/Long Gore-Tex, seam sealed Bag Cover. Just what I was looking for, and mine weighs in at only 8.25oz including stuff sack.


                  Did not work for me

                    Pros: This bivy is light and simple, minimal design.
                    Cons: Small, tough to get into and out of, poor quality.
                    I tried the Black dimamond and the Mountain Hardwear Conduit SL, sent them both back and got the Mont Bell UL Gore Tex Wide and Long (8.25 oz including stuff sack). Love the Mont Bell.


                    Under the stars...

                      I spend 6 months a year sleeping under the stars. I don't like tents. I use to freeze in my sleeping bag in the spring and fall months. When I got the winter bivy sack, it added the extra 10-15 degrees I needed to stay warm without a tent. Just by blocking out most of the wind, that a tent would do. It is small and very light weight.

                      thank you! not everyone is a high altitude whiner who is overweight and then tries to save 4 oz and complains. alot of us ultralighters do it as a lifestyle, not a heroic adventure that whisks us off to exotic lands and world famous/feared peaks. this bag works fantastic as this reviewer said. just dont "buy" into lightweight. get creative. add some DIY and live less frustrated, and plenty comfortable. great review. thats what i got it for, use it for, and it performs fantastic.


                      A Night in Red Rocks

                        I got this sack for a trip to Red Rocks thinking it might come in handy if I went in to the backcountry. Little did I know I would be using it the first night because we were short one tent. It kept me dry and extra toasty even though the outer shell was wet with dew. It also packs insanely small. Darn good sack at an awesome price!


                        Light and useful, with limitations

                          Used for winter camping in -10 to 20F.

                          -Excellent, light protection from elements for bag.
                          -Above-average breathable.

                          -Single zipper across shoulders is challenging for inserting pad and bag(s), especially when freezing (no side zip).
                          -No face panel; zipper slit not ideal for external visibility or ventilation.


                          Great sack

                            Used the bivvy bag with a PHD bag in Austria at minus 26C and it performed brilliantly. The bag is VERY light, but still surprisingly strong. You may need to pop a bit of string onto the Zip puller to operate with gloves, but otherwise a very good bit of kit.


                            BD winter bivy

                              The weight and compression are great. I used it in heavy rain, it helps about as much as it weighs…zero. Not that it is designed for that anyway. Otherwise it does a fantastic job of blocking morning dew and snow won’t stick to it either. It’s excellent when used with a shelter, I'm able to use my down bag more often thanks to this! The tiny zipper is a pain with cold/wet hands, and the material has a "static cling" effect when damp. Great for the minimalists! BD has great customer service too.


                              BD Winter Bivy sack

                                When I summited Denali, I had this lightweight gem in my pack. I also use it to extend the warmth of my 900-fill TNF 15-degree bag. Very versatile!