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Mountain Laurel Designs Soul Bivy Side Zip (eVent Top)

in Shelters - Bivy Sacks

Average Rating
5.00 / 5 (3 reviews)

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John Mowery
( Mow )

Minnesota, USA
Mountain Laurel Designs Soul Bivy Side Zip (eVent Top) on 08/27/2007 10:40:26 MDT Report Post Print

Rating: 5 / 5

This is an exceptional piece of gear. Very well made and thought out. The side zip makes getting in and out of the bivy very easy. The straps secure a sleep pad well. The mosquito netting does a nice job of allowing good ventilation - a problem with other bivy's I've used. Spin drift was no problem, although I haven't slept out in direct rain without a tarp. The regular cut is certainly narrow so side sleepers may want a wide version.

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Tony Wong
( Valshar )

San Francisco Bay Area
Fully Featured with Outstanding Workmanship on 06/01/2008 22:39:02 MDT Report Post Print

Rating: 5 / 5

Mountain Laurel Designs Soul Bivy Side Zip with eVent top, Silnylon 2.0 bottom, built in hoop wire, regular size, but in the wide option, which allows for a sleeping pad thicker than 1".

Weight: 13 oz.

2007 Model

The bivy arrived with long strips of fabric/ribbon that was attached to the pull zipper of the side zip.

This was very helpful to have in closing the bivy while wearing snow gloves and the zip rarely snagged.

This zip extents all the way to the head area where there is another zipper on the opposite side, allowing you create a small blow hole for air while limiting exposure to rain.

The hood area does incorporate a short brim area over the zipper to help deflect moisture from the waterproof zipper.

Despite being waterproof, in a moderate to heavy rain, the brim would not be sufficient to prevent water from entering the bivy. A tarp would be highly recommended.

The hood area incorporates a second set of zippers that lays just under the first set. The second set of zippers being for the built in bug mesh.

The zippers for the bug mesh are very small and are difficult to impossible to use with gloves.

This should be easily solved by simply cutting some of the fabric/ribbon attached to the side zip and using it to create zipper pulls for the bug netting.

There are two sets of sleeping pad loops to prevent your pad from shifting out of place. One set on the floor of the inside and one on the underside of the bottom.

The exterior loops on the bottom included adjustable elastic cord to hold a pad in place.

I have yet to use these and have removed from from my bivy to save weight.

As I have the wide version of this bivy, I find that I have plenty of interior room for my 1.5" Thermarest Prolite 4 pad and my Marmot Helium EQ 15 Degree bag.

If I were an active sleeper or used my pad on the exterior of the bivy to allow more interior room, I might find this feature useful.

There are two loops incorporated into the design of the hood. One of these just above the brim on the top and the other would be located on the lower zipper near the chin area.

I have used the loop attached to the brim as a guy line attachment point to pull the hood up higher off my face to create more head room.

I presume that the loop at the chin area is for the same purpose, but I can not see why someone would use it over the loop on the brim as attaching at the chin area would seem to create less head room and might interfere with opening and closing the bivy.

The bivy included a small stuff sack for storage, tube of seam sealer, and some scraps of fabric for possible repairs for tears in the bivy.

I have had an opportunity to use this on four trips so far, two of them in a snow trench winter camping and one of them in the rain using the MLD Silnylon Poncho Tarp for overhead cover.

Ron's workmanship is simply top notch.

His sewing shows a clear attention to detail.

I spent 4 hours seam sealing the entire bivy and the stitching was straight and clean.

Note: I found that by stuffing the bivy with 6 sleeping bags allowed me to easily seam seal the whole bivy by myself on my dinner table with a minimum amount of mess and without excessive use of seam sealer. I used an extremely thin fabric brush that was just slightly wider than the stitching. Having the bivy stuffed fully of sleeping bags allowed me to press the thin amount of seam sealer into the stitching.

My first time using this was in the winter of 2007 near Kirkwood ski resort in CA.

I slept outside on the snow under a MLD silnylon poncho tarp in an A frame shape, using snow blocks to seal up the back end and creating a 4 ft tall windblock/wall at the head end. Snow was applied along the side edges of the tarp to prevent any drafts inside.

I used two sleeping pads: blue foam pad and a prolite 4 self inflating pad.

I slept with 5 layers of clothing on the upper body and four on the lower and slipped into my 15 degree Marmot Helium EQ bag.

Starting temperature at midnight was 8 degrees F.

Lowest temperature was 5 degrees F.

The wire hoop does help create an adequate head space to sleep in and to store a few items above the head. (I am 5 ft 6 in tall).

I was able to sleep comfortably in the bivy and even was able to lay on my side quite easily. As I sleep cold, this was impressive to me. The only part of my body that was chilled during the night was my head. I was only wearing a light fleece hat.

Admittedly, I did have one incident that night where I felt clausterphobic and had to open up the bivy to give myself some air and space.

I had zero condensation in the bivy despite only having a 6 inch wide blow hole for air.

Two additional snow camping trips in Jan & Feb 2008 with the Sierra club in Yosemite in which I slept in a snow trench, using the MLD poncho tarp as a cover yielded the same condensation.

Oddly, the only time I had condensation inside was in May 2008 in Yosemite at Lake Vernon, after the snows melted.

The inside of my bivy was just raining and my sleeping bag was completely wet to the touch.

The 2nd night, I sleep with the bivy completely zipped open with just slightly less condensation forming.

I can only conclude that the moisture problem was the environment vs. any failure of the bivy.

Two friends of mine on this trip had the Double Rainbow Tarptent and experience similar problems with condensation raining on them.

Observations: The wire hoop on the bivy is helpful to keep the shape of it the hood of the bivy but not needed as an option. I found that using the exterior loops on the hood of the bivy to pull the hood area off of my face worked better and provided more space than using the wire hoop alone.

The bivy is well made and with the 2.0 Silnylon bottom, I have noticed no damage at all to the bivy.

The eVent fabric works as advertised, though I did have one instance in which I had massive condensation, which probably has to do with dew point and no breeze vs. a problem with the fabric.

Ron makes a great product, which I expect to get many years of use out of.

I wholeheartly recommend this bivy as a "bomber" shelter.

*****Update 2013*****

Ron's workmanship and bivy have been amazing. It has been almost seven years of use and the bivy looks as good as the day that I bought it and carefully seam sealed it. Not a single stitch has come loose and the silnylon 2.0 floor has held up really well without a single puncture. I have never had to do any repairs and I have washed it a number of time in my front loader washing machine with no ill effects. I have done the 165 mile Tahoe Rim Trail, the 220 Mile John Muir Trail, a 130 mile section of the PCT from Lake Tahoe to Yosemite, and a number of other smaller trips...including 12-13 hours of blowing rain near the top of Mt. Whitney. Ron's workmanship holds up and I am hard pressed to think of what could be improved other than the floor being completely waterproof. I have had some situations where I have had a small wet/damp spot on the inside of the floor of the bivy, but nothing that would have remotely come close to endangering my down quilt. Honestly, I consider this my bivy for life. I am careful with my gear and campsite selection. I see no reason why I can not get another seven years or more out of Ron's bivy. The only down side, it is 13 oz, which is twice as heavy as the super light bivy, but it is waterproof and bomber.

Bottom line: Worth every penny. Don't think about it, just buy one from Ron. You won't be disappointed.


Edited by Valshar on 11/06/2013 00:45:15 MST.

Price comparison from GearBuyer:
Therm-a-Rest Prolite 4 priced at: $69.97 - $69.98
Therm-a-Rest ProLite - Women's priced at: $57.34 - $119.95
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Douglas Durham
( djdurham )
Very brerathable waterproof bivy on 06/04/2008 10:25:33 MDT Report Post Print

Rating: 5 / 5

Last weekend I went on an 18 mile overnighter on the AT in southwestern Virginia. The elevation gain and loss was over 7000 feet. The daytime temperatures were roughly in the high 70s; and at night it got down just below 60.

I used four items from Mountain Laurel Designs. The Ark pack, the Soul side zip Event top bivy, and the silnylon poncho, and the Spirit Quilt.

This bivy is completely waterproof for those who like to sleep out under the stars.

I chose to use this Bivy because I was also using a poncho as a tarp and wanted to be sure that if it rained I would be dry, since this was the first time I was going to use a poncho is a tarp. The attractive feature of this Bivy, to my mind, is that at about 11 ounces you have a waterproof Bivy. Additionally there are bungee cords on the bottom of the Bivy to hold your closed cell foam pad in place, eliminating the need for a ground cloth and protecting the bottom of the Bivy. Inside the Bivy are also some bungee cords which would allow you to hold in place an inflatable torso sized pad, should you wish additional comfort. I for one enjoy not rolling off my pad at night.

I was using the MLD Spirit, a 12 oz. synthetic quilt. I could detect no moisture on the top of the Bivy nor on the top of the quilt. So it would appear that this two layer Event Bivy is very breathable.

See Web page for details.

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