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Lance Marshall
(Lancem) - F - MLife

Locale: Oregon
Evolution of a MYOG bivy on 06/24/2009 11:50:53 MDT Print View

After 100 +/- nights in this MYOG bivy I was ready for some design changes:
Bivy on PCT

The bivy was originally designed with a full ‘storm hood’ in addition to the netting. The bottom is silnylon and the top is M90 DWR from Thru-hiker.

Original design:
bivy with hood up
bivy with hood down

The storm hood didn’t last long before I removed it:
1. For mostly fair weather backpacking, it wasn’t necessary.
2. It added weight, especially the extra 83” of zipper.
3. Fully enclosed, oxygen level inside dipped to 19%.

After many nights use, the following shortcomings were evident:
1. The perimeter zipper required a lot of body contortion to fully unzip from the inside.
2. When not needed, the netting was annoying. (I should have added ties to hold the rolled down netting.)
3. On a number of mornings, there was condensation in the footbox.
4. On many warm, buggy nights, I could have used more netting and less M90.
5. Inserting my pad and quilt into the bivy was a pain.

So after some brainstorming, here’s what I came up with.
1. Long center zip.
2. Center netting strip similar to Cesar’s and Stick's
3. Shorter cone. 9” tall vs 18’ tall.
4. Wider girth.
5. A little more style.

New Bivy 1
New Bivy 2
New Bivy 3New Bivy 4

Initial impressions:

  1. Much easier to zip/unzip from inside.

  2. Much easier to insert pad and quilt.

  3. When unzipped, netting can be pushed out of the way and stays there.

  4. More elbow room.

  5. 6 ounces in silnylon/M90/nano-seeum and 68” #3 zipper.


-Lance

Edited by Lancem on 10/22/2014 20:48:57 MDT.

James W.
(jimmyjam)

Locale: Mid Atlantic
MYOG My First Pack on 01/20/2012 17:59:55 MST Print View

Lance,

That's how I wanted it to look.Thanks for showing me how to do that.