Get 10% off with: EXTRA10

Outdoor Research Stargazer Bivy

Ascentshell 3L Fabric / Hoop
Weighs 544g (excluding bag)
Code: SS19865
  • Now £239.99
  • (FREE UK & EU Delivery)
+ In Stock Now | Usually dispatched within 24 hours

The Outdoor Research's Stargazer Bivy is a simple, effective and very lightweight shelter enabling you to get as close to the nature as possible whilst protecting you from the elements.

The easiest bivy choice for alpinists, backpackers, and campers who prefer a room (or shelter) with a view

The all new Stargazer Bivy is the most comfortable and scenic way to enjoy a solo night outside. Fully seam-taped, breathable, waterproof AscentShell™ technology ensures you'll stay safe from the elements, while a newly designed side entry makes it easier and faster than ever to get in and out of your shelter. The fan favorited feature: An enlarged head space covered by a large mesh screen that keeps bugs out and lets views in for the best backcountry stargazing of your life.

|Click here for more info on Outdoor Research, product updates and New Season information.

The Outdoor Research's Stargazer Bivy is a simple, effective and very lightweight shelter enabling you to get as close to the nature as possible whilst protecting you from the elements.

The hoop is at a slight angle which increases the stability of the bivy bag. The Stargazer has a mesh inner at the head end so when the weather is kind you can enjoy your campsite view whilst keeping the insects at bay. Having the entrance on the side of the bag gives easier and more dignified access to your shelter for the night.

- Reviewed by Ultralight Outdoor Gear

Read reviews here:


Help and advice:
  • Fabric Performance: Waterproof, Breathable, Air Permeable, Fully Seam-Taped, Large No-See-Em Mesh Screen
  • Design Features: Delrin Single-Pole System, Extra Head Room to Store Gear, Reflective Logo and Trims, Large side Opening, Two Stake Loops, One Guy Line Loop, High-Volume Toe-End, Extra Large Mesh Screen for Star-gazing

By placing quality first, we can offer the finest guarantee in the industry for each and every product – the Outdoor Research Infinite Guarantee™. We believe so strongly in the quality of the apparel and gear we make that if our product fails to meet your needs at any time, we are happy to replace it. Our products are guaranteed forever.

  • Weight with pole: 544g (excludes bag)
  • Weight without pole: 496g
  • Length: 82in
  • Width: 26in (widest), 19 1/2in (narrowest)
  • Height: 20in (highest), 15in (lowest)


  • Ascentshell 3L, 100% nylon, 20D mechanical stretch ripstop face with 100% polyester 12D backer, 100% nylon, 40D ripstop with TPU lamination floor
Showing our 2 Outdoor Research Stargazer Bivy reviews with an average rating of Excellent. Would you like to write a review?
Review Summary - 5 out of 5 based on 2 ratings.
February 7, 2020 | Adam James
Close to perfection

OR say that their jackets made with AscentShell are not ideal for inactivity in prolonged rain. Then they made a bivy bag out of it... hmmm... let's see how this works out...
Size: I'm a side-sleeper, 6ft, 46" chest, wide shoulders. With a 1" sleeping pad inside, and zero degree celcius down sleeping bag, the space was was fine but only just. Could accommodate about 2" taller but not much wider. If using a big down bag, may not loft fully unless you put sleeping pad outside. If you think "sleeping bag cover with hoop" rather than "army bivy bag you can get your kit in" then you'll have the idea.
Nice stuff: Bottom fabric seems durable. It's grippy so sleeping pad stayed put. The hoop stays in place without pegging it out, if you fill up the interior (I had big inflatable pillow), so you can get the benefit of the hoop even on ground that won't take pegs. The separate zippable insect netting and outer fabric flap make it versatile and work well. Side-entry works well but a slightly longer zipper length would make it easier.
Unpleasant stuff: The ends of the plastic rod that you insert into the hoop are not rounded/finished. You can hear it scraping the fabric as you insert it, but it appears to be reinforced fabric. The hoop does let this expensive product down though - it feels cheap. The hole for insertion could also do with being larger / better finished. Fiddly.
Bad stuff: There are just two pegging points. One at head and one diagonally opposite at foot. This proved inadequate in the wind. Pillow was ejected into the dirt and nearly lost the whole bag. Needs two points at both ends. You can fudge a second peg at the head end by sticking the peg through the Velcro closure for the hoop rod, so you can compensate for this shocking design decision to some extent.
Performance: Astounding. Tried it indoors, warm room, no air movement, with just the netting flap zipped up. Woke up to zero condensation even at foot end. Tried it in Snowdonia, wind-driven rain all night (approx 40mph gusts according to forecast), 5 degrees Celsius, down sleeping bag. Outer zipped up with just a couple of inches gap between zippers, so was breathing into it all night. Got out in the rain and returned twice, entering it wet. Felt warm and cosy all night. Even the foot box of the sleeping bag was lofting and felt bone dry by the morning. It's been a long time since I spent big on outdoor gear. Don't regret this one bit. Truly amazed. I've seen someone use the Interstellar (same fabric) bivy in snow, freezing temps, and they said it was dry inside, so I'm very optimistic about this.

Ultralight Outdoor Gear Limited
March 26, 2019 | Tom - UOG
Simple effective shelter for enjoying the outdoors.

Just the one night of use so far but had a lovely night with the mesh shut and the outer bag open. I was cosy but still felt close to nature. The angle of the hoop seems really stable without resorting to pegging. I had a bit of space around my head for spare clothes and kit but I'm not the tallest. Really looking forward to more nights in it.

Ultralight Outdoor Gear Limited