Side Zipper Ultralight Bivy:


  • This is the same as our Standard bivy with one exception. The zipper goes across the chest just like on the Standard, but then takes a turn down the left side for 24", creating a bivy that is easier to get into. (Right side is also available for free, just contact us before ordering. Left side is by default)

    All fabric types/sizes are the same as our Standard, only difference is the zipper. The extra zipper adds .5oz, so the weights for the bivy with this side zipper are the following:

    - 6.2 ounces for standard length, standard girth in Argon90
    - 5.4 ounces for standard length, standard girth in Argon67

- Argon67 and 90 are ripstop DWR coated nylon fabrics. They both have excellent breathability. Both shed water nicely, with the 90 being slightly more water resistant than the 67.

- #3 YKK zipper with two double sides pulls
- Silnylon stuff sack included

-Made in Montana


Length: Standard fits users up to 6'1", Long fits users up to 6'4"

Width: Standard is 73" in girth at the shoulders, 64" at the feet. If the user is under 180lbs, use a regular width.

Wide is 78" at the shoulders and 68" at the feet. If the user is 180-220lbs, use a wide. If you use a 25" wide pad, go with a wide regardless of weight.

For users over 220lbs or 6'4", please contact us for custom sizing. Custom sizing is free in nearly all cases.

Each oversize option (long length, wide girth) adds about 0.3oz, so a long/wide would weigh ~0.6oz more

Were you quoted extra for custom work, or need to add international shipping? Click here

Please check the homepage for lead times before ordering to see the date when your bivy will be sewn and shipped.

Argon90 Sizes
Argon67 Sizes
Made in the USA













Contact us:

Any questions? Send us an email at, and we'll help you out!


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Side zipper ultralight bivy


side zipper ultralight bivy


side zipper ultralight bivy


Ultralight Side Zip Bivys


Ultralight Side Zip Bivys