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With fully taped seams and waterproof breathable Conduit SL shell fabric, the Mountain Hardwear Conduit SL Bivy keeps you dry when sleeping out in inclement weather. This bivy sack also zips onto sleeping bags with compatible 70-inch zippers and features a draw cord hood to cinch down when the storm cranks up.

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Mountain Hardwear Conduit SL Bivy

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Here's what others have to say...

5 5

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I ordered this but got the new version which is blazing awesome. weighs 14 ounces and is tiny. works great brought it on a backpack trip to kings pk and at one point had puddles in it and perfectly dry inside. it is way more breathable than the old version. overall no regrets

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Mountain Hardwear Conduit SL Bivy

Mountain Hardwear Conduit SL Bivy

Took this bivy on a backpacking trip in the Sawtooth mountains.

4 5

Bomber

Used this bivy last night in the middle of a semi frozen mud/ice field. No other protection, temperatures dipped to 0 with 20-30 mile an hour winds and snow. This thing held up and kept me warm and dry. Used with a Sherpa Adventure Gear Tenzing -40 bag (which has a center zip) and it fit perfectly. A little condensation in the morning but it wasn't more than what to expect in a tent. Overall a great alternative to bringing a tent for 4 season adventures.

Responded on

It was not 0 that night i was there it was like 15 just saying

3 5

Good 3 Season Bivy

The bivy's been great for spring, summer and fall weather, even with a good downpour. I love the extra long zippers and the cinch cord works pretty well but it would be nice with a mesh face cover for bugs. The bivy has treated me well but I refuse to use it in the winter because it doesn't breath as well as the gore or event fabrics, and I've woken up with a wet and cold bag on some pretty chilly winter mornings (-10 - 0 degrees). Overall good product, pretty light and packable and good in 3 seasons but the conduit just isn't breathable enough for the winter months.

. This bivy sack also zips onto sleeping...

. This bivy sack also zips onto sleeping bags with compatible 70-inch zippers Specifically, does that mean it zips onto my Mountain Hard Wear Performa 32?

Responded on

J Osol. Not familiar with the Performa 32. Which country are you in?? If your bag has a FULL LENGTH zip then this bivy will work with it. If your bag does NOT have a full length zip then the bivy will still work... it just won't zip into your bag. Make sense?? Hope this info helps!

Responded on

The length of the zipper isn't the only consideration. This bivy's zipper won't connect to the zipper of my sleeping bag the zipper head of my bag is too small to zip it in. But I prefer to not zip it in anyways, then I can unzip one and leave the other zipped.

Does this fit the long bags by mountain...

Does this fit the long bags by mountain hardware?

Responded on

Yes. It should fit even long bags... Cheers!

4 5

Outdoors without a tent

Read all reviews before picking this bag and was happy that I did because it performed just like everyone said it would. Well made and would buy again but as people said it does retain moisture inside because it does not breath. Does protect from outside dampness but remember it it rains and your head is sticking out you will get it wet of course. Great value compared to others.

Unanswered Question

What are the demensions of the bivy both...

What are the demensions of the bivy both unfolded and folded?

4 5

Review Title

Awesome bivy. Love the full length zipper!! However, this bivy could pack alot smaller and be alot lighter if they didn't put such a massive zipper on the bivy. It's weird to see a heavy duty K-Mart style zipper on super light Conduit fabric. Bad choice for Mountain Hardwear.

Responded on

I need information about the degree ???

Responded on

you try making a zipper that waterproof without having it be that big.

5 5

Great bivy

I love this little bivy and it is the quality I expected from Mountain Hardwear. I match this up with my marmot atom bag in my search pack and it gets the job done all year round.

2 5

Poor performance.

I have used this bivy several times and it performs much better in certain situations. In the canyonlands it was fine, keeping me dry during a light rain and keeping my sleeping bag out of the sand and dust.
However, during a winter camping trip my down bag was consistently wet with condensation from the inside of the bivy. During this trip I slept in a mega mid, a snow cave and simply under the stars, in each case the bivy did not breathe well enough to keep my sleeping bag dry. I returned it with the intention of finding a better bivy.

Responded on

All bivys will experience some internal condensation, especially in colder weather. This is because the inner surface of the bivy will be the same as the outside temperature, and the heat generated by your body will not be sufficient to drive perspiration vapor through the breathable membrane before it condenses on contact with the inner surface of the bivy. In fact, perspiration vapor will often condense INSIDE the insulation of the sleeping bag at the point where the gradient between the ambient external temperature and your skin's temperature is at the dew point, especially since the humidity inside the bivy will be very high.

Responded on

OK Sailor, I see the logic of what you are saying. I had the same personally surprising experience on a winter trip just gone (I'm in Oz, it's winter here at the mo). I was using a MH Phantom 32, a Fairydown down liner bag and this bivi, sleeping in a 3-person tent (full) in the snow. I was using the bivi to protect the sleeping bag from condensation getting on the bag from the tent wall. What is the solution? Avoid using the bivi in tents and reserve it for open bivis?

Responded on

From what I gather, some condensation will occur during winter unless you beef up the temp in the tent ;)

Responded on

Perhaps one could focus on keeping the moist down by not breathing into the bivy, but out. And wear thin wool underwear to catch some of the sweat from you body before it vaporizes.

Responded on

Joh, if you're always going to be inside the tent, try using the mont bell sleeping bag cover. It's waterproof, but doesn't zip closed.

Responded on

In the winter I use a vapor barrier inside my sleeping bag. I wear light cotton pajamas to stave off the "sticky" feeling that can develop inside the vapor barrier. This system keeps my sleeping bags from getting moist from any condensation that would form inside the bivy from body moisture or breathing. In cold and humid conditions you will always have condensation inside a bivy so . Just my two cents.

Responded on

Conduit fabric is just not very breathable. Hopefully MH makes a bivy with the new Dry Q fabric soon.

Would this bivy (or any bivy for that...

Would this bivy (or any bivy for that matter) add any warmth to a bag? More specifically during winter camping/backpacking trips? Thanks.

Responded on

This bivy would add warmth to your bag by not allowing as much heat to escape. As to any hard and fast rule for adjustment to your bag's original temp rating, the data doesn't exist and probably varies considerably depending on conditions inside (perspiration) and outside (humidity, precipitation, etc.) the bag. Some bivies will add warmth, some will not, and it depends on a lot of variables such as fabric, size, and ventilation).

Responded on

Yes a bivy bag (this one or any) will add warmth to a sleeping bag. It's like putting a shell on over a jacket. It's a little warmer. But the main point is that it keeps wind, rain, snow off. As to the warmth added, one can't really say that it will add X number of degrees to the temp rating of your bag. It may be 5 or 0.05, that is what I think BAinUT was saying. I usually figure it will add little to none on its own and maybe 4 or 5 inside a tent/shelter/snowcave.