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Molecule Bivy regular


Lightweight, Streamlined, One-Person Shelter
COLOR taos
SIZE: 1size - In stock
free shipping - This one’s on us!
Infinite Guarantee
One of the most tricked-out in our collection, the classic clamshell Molecule Bivy sports an overlapping zipper for easy breathing, a durable, waterproof, anti-fungal-coated 70D floor, a vented foot box and a no-see-um net to keep the bugs out. Small, lightweight, and weather-ready, this is perfect for light solo missions. The Regular Size Molecule Bivy is 84 inches long.
Fabric :
100% nylon 2.5L
70D ripstop
pu coating
100% nylon
70D with TPU lamination floor
Dimensions :
84 in. long
18 in. head space
11 in. foot box
25 in. head width
21 in. foot width
Weight :
21.5oz / 610g Avg. Weight for size One Size
Fabric Performance :
Fully Seam-Taped
No-See-Um Mesh
Hydroseal® Floor
Anti-Fungal Coating on floor
Design Features :
Vented Foot Box
Five Stake Loops
One Guy Line Loop
Internal Mesh Pocket
Reflective Webbing


Awesome lightweight bivy


Fantastic for low rain areas. Used this bivy for an ultralight shelter backpacking through 14ers in the sawatch range in Colorado. This thing kept me warm bivying at over 13,000 feet on Mt Elbert and I found it convenient enough that I continued to use it even when camping near the car. Super compact but not a good place to sit out long storms. In stormy weather condensation will build up no matter what but it dries quickly. This bivy adds warmth and is pretty great but I'd be dubious using it in the north east where the storms can last a while and may not dry out the next day.



The Bivy Of Your Dreams


This is the Bivy I'd been searching for: lightweight, compact, with no unnecessary thrills. Favorite features: (did I say lightweight?), foot vent, and voluminous enough for my 2" sea to summit air mattress and 20* bag.

Belgrade, MT


Improved Warmth


The product is better oversized than too small. Some more vents might be an improvement. The bivy really enables a lightweight sleeping bag in cold weather, although some frost always forms on the inside surface. I was mistakingly using the bivy upside down at first. In the correct position the mesh head cover works better. The product is best for improved warmth. Thanks for the great product.

Flagstaff AZ


Awesome. Get one.


I bought this for late fall and winter camping. Camping where I don't need to use a bug net. And this product has been awesome. It adds warmth and protection when out in the back country. I was initially concerned about the weight, but this product packs down and really weighs almost nothing once it is packed away. Get one and I don't think you will regret it.



Good product but not for too cold of weather


The bivy worked great as far as space and I am 5' 10" 190lbs and it fit my sleeping bag inside also. When I stayed in the bivy it was 15 degrees so I decided to zip it up to stay warm. Unfortunately a few hours later I woke up to the top of the bivy soaked with condensation. Had to open it so I wouldn't get wet. But definitely would use it if it was warmer

San Antonio,tx

Alaskan Refuge


Although there are more expensive and heavier bivy's in OR's lineup I wanted something ultralight that would work in Alaska and Montana for all seasons. In winter the bivy extends the Plasma 15 rating closer to 0 degrees. The photos show how I added an upgrade 3rd party mosquito hood which allows the ultimate in protection during summer pursuits. My Marmot plasma 15 with Thermarest insulated NeoAir mattress fit inside surprisingly well. I could add a closed cell foam pad as well and still have room.



Molecule Bivy regular

4.3 6



Is the top material breathable and waterproof? IS the bottom material waterproof?

Whoopee pie Dave

Hi Whoopee pie Dave, Sorry for the late response. The upper/top isn't as breathable as the Helium, Aurora, Alpine, or Advanced Bivy due to the denser nylon (70D vs 30D), but it is still breathable for waterproof materials. The bottom/floor is waterproof. Thanks for contacting OR, Paul

How am I supposed to use the two stake loops at the top of the bag? I'm not using a sleeping pad of any kind, so the sac just kind of collapses a bit when I lay in it. Can't figure it out.


Hi Brandon, unfortunately the stake loops are there to prevent the bag from moving from it's initial position and it does not aide or help the bivy give it structure. Because of the design of the Molecule Bivy and the absence of a pole system, the material of the bivy might have a tendency to collapse inward. Thanks for contacting OR!