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Outdoor Research
Interstellar Bivy

4.314285714285714 out of 5 stars
35 Reviews

Out of Stock

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Interstellar Bivy

The Outdoor Research Interstellar Bivy combines enhanced breathability with exceptional waterproofing worthy of four-season adventures whether you're backpacking minimally in the summertime or mountaineering in wintertime. Its waterproof Ascentshell membrane is air permeable instead of breathable, meaning it will breathe the moment you enter the bivy, as opposed to standard breathable membranes that only breathe until after you build up moisture with breathing or sweating. The Delrin single-pole system is quick and easy to set up, and you can leave it at home if you want to save some weight and packing space.


Details

  • Four-season bivy for alpinists, backpackers, and winter campers
  • Ascentshell is waterproof and air permeable for high breathability
  • Multi-configuration lets you sit up an organize gear in bivy
  • Delrin single-pole system, guy line loop, and two stakes for setup
  • Item #ODR00X4
Material
[membrane/laminate] Ascentshell (3-layer) [face fabric] 100% nylon (20D) [backer] 100% polyester (12D) [floor] 100% nylon (40D), TPU laminate
Poles
Delrin single-pole system
Ventilation
no-see-em mesh
Seams
fully sealed
Interior Height
17 - 15in
Floor Dimensions
82 x 26 - 19.5in
Packed Size
19.9oz
Trail Weight
18oz
Recommended Use
backpacking, mountaineering, ultralight backpacking, winter camping
Manufacturer Warranty
lifetime

What do you think about this product?

Overall Rating

4.5 based on 35 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 3 reviews
3 Stars - 4 reviews
4 Stars - 7 reviews
5 Stars - 21 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
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5 out of 5 stars

January 5, 2022

I was able to use this one evening in fairly cold weather in a pretty good down pour to keep me dry and wait out a storm while I was still about 10 miles from the car. Worth every penny

Zack B
ExpertVoice.com

Originally reviewed on ExpertVoice.com

4 out of 5 stars

April 6, 2021

The amount of zippers can be overwhelming but once you get use to it its not bad and the versatility it offers is worth it.

Kyle L
ExpertVoice.com

Originally reviewed on ExpertVoice.com

4 out of 5 stars

March 27, 2021

Love it so far...

So far, ive taken it winter Xc skiing up in the Boundary waters and it's great. Using a synthetic -20 bag, I didn't see any compression to take away from my heat which was great. This is my first bivy but the zipper system seems like there's a ton of zippers. One thing I'd love to see is a place to roll off up the bug netting and tuck it away. Otherwise It's just there to deal with. So far love this little shelter.

Jay T
ExpertVoice.com

Originally reviewed on ExpertVoice.com

5 out of 5 stars

March 15, 2021

Awesome Bivy

Great bivy, quite roomy for how small it is packed. Nice and warm when the outer shell is closed, and very easy to set up. Just got back from 5 days in the Everglades with it and had zero complaints.

Stephen
outdoorresearch.com

Originally reviewed on outdoorresearch.com

5 out of 5 stars

January 12, 2021

So far, so good

I've used this bivy twice since I purchased it and I'm pleased so far. Using user ratings to make my purchase, I noted the comments about the many zippers. Therefore, I studied the zipper set up when I started and that helped a lot. I still intend to buy a similar-sized tent footprint to reduce the risk of damaging the floor with use.

Alan
outdoorresearch.com

Originally reviewed on outdoorresearch.com

5 out of 5 stars

January 12, 2021

Yes, I would buy this bivy again

I've used this bivy twice since I purchased it and I'm pleased so far. Using user ratings to make my purchase, I noted the comments about the many zippers. Therefore, I studied the zipper set up when I started and that helped a lot. I still intend to buy a similar-sized tent footprint to reduce the risk of damaging the floor with use.

Alan
outdoorresearch.com

Originally reviewed on outdoorresearch.com

3 out of 5 stars

January 5, 2021

It's good, but not good for me, here's why...

The gore-tex material is waterproof and windproof. If you can get into this bivy, you have much greater chances for survival in harsh, wet, cold and windy conditions. The quality is top notch. Adds a lot of warmth. The reason why this bivy does not work for me is mainly due to the size and how difficult it is to deploy in the dark when I am cold and tired. The zippers require warm, loose fingers and you will want to practice setting up this bivy before using it in the field. Setup time for this bivy can be very long and for a human of my size (6,1", 235lb, 36" waist, 48" chest), it is so tight that you must zip yourself in with both arms, being careful not to bust the seams. I hope OR can make a single layer, simple version of this bivy, where the zipper is in the middle like a duffel bag, in an XXXL size. I need something I can unroll, unzip, lay my pad down, maybe my sleeping bag, get in with my boots on and then reach straight down and zip up with one hand, without taking my gloves off. If it is big enough, then I can put my pack in above my head which will keep it dry and keep the bivy off my face. That would be rad.

RJ
outdoorresearch.com

Originally reviewed on outdoorresearch.com

5 out of 5 stars

November 14, 2020

Interstellar is Very Steller

Love this bivy. Easy to set up, breathable, stayed warm in cold temps. Use primarily when bike packing!!

kathy M
ExpertVoice.com

Originally reviewed on ExpertVoice.com

4 out of 5 stars

November 14, 2020

Excellent design

Excellent design. Paired with a few thermal layers and good sleeping bag, and you're golden

Alexandre
outdoorresearch.com

Originally reviewed on outdoorresearch.com

5 out of 5 stars

October 30, 2020

Kept me dry in the rain! The why the pole is behind the head it makes it easy to unzip the side a bit to give airflow while it's raining. Had a little condensation at the foot bed of my sleeping bag when it's completely zipped up but very minimal. Also, actually does roll up easily, air doesn't get stuck in it, it will slowly go through any part of it. Overall really happy with it.

Sarah S
ExpertVoice.com

Originally reviewed on ExpertVoice.com