Cuben Bivy:


One of the lightest bivys we offer, weighing in at 4.25oz with the chest zipper option. This bivy is for the serious ultralight backpacker who wants to save as much weight as possible.

Standard Features:

-0.8 oz Dyneema® Composite Fabric floor (current floor color is light gray)

- Argon67 breathable/water resistant ripstop nylon top fabric

- 0.5oz Noseeum mesh window

- #3 YKK zipper with two pulls, which can be opened and closed at any point along the zipper track. Two zipper options:
Chest Zip: Lightest option, minimalist entry. Zipper goes across the chest
Side Zip: After going across the chest, the zipper turns down the left side for 24". Easiest to get in and out of. If you'd like it down the right side instead, just send us an email after ordering.

-4.25oz for standard length/standard girth with a chest zipper
-4.5oz for standard length/standard girthwith a side zipper
See "Sizing/Specs" below for more weights & dimensions

- Grosgrain pullout to keep netting off face (shock cord included)

- Double-stitched seams

- Loops at footbox and head-end corners

- DCF stuff sack included

- Made in Montana

Cuben Bivy Specs

Reg/Reg Reg/Wide Long/Reg Long/Wide
Weight (Chest Zip, Side Zip) 4.25oz, 4.5oz 4.5oz, 4.75oz 4.5oz, 4.75oz 4.75oz, 5.0oz
Shoulder Girth 74" 82" 74" 82"
Foot Girth 65" 69" 65" 69"
User height Up to 6' Up to 6' Up to 6'4" Up to 6'4"


Sizing notes:

-If you use a 25" wide pad, go with a wide bivy. In general, users under 180lbs fit well in a regular girth, and 180-220lbs in a wide.

For users over 220lbs or 6'4", please contact us for custom sizing. Custom sizing is $5 in most cases.

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. Lead times are long right now (7+ weeks) during the busy season.

Made in the USA

Contact us:

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


Click images to enlarge

Ultralight Bivy - cuben


Ultralight Bivy - cuben


Bivy Zipper Options