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Outdoor Research
Alpine AscentShell Bivy

Out of Stock

Don't worry though, we have a lot more Bivy Sacks in stock than that.

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Why We Like The Alpine AscentShell Bivy

"Less is more" doesn't always ring true, but the Alpine AscentShell Bivy packs as much as possible into a small alpine shelter. On our lightest ascents into the wilderness, this bivy offers serious protection in all four seasons. Outdoor Research's Helium AscentShell membrane keeps us secure in unruly weather, and it boasts breathability that ensures our outdoor comfort during the hotter months as well.


  • Four-season bivy for alpinism and solo backcountry adventures
  • Helium AscentShell floor and fly keep rain, wind, and snow at bay
  • Mesh screen allows more airflow on hot summer nights
  • Large, step-in opening offers easier, more comfortable entry
  • Single pole design makes setup fast
  • Packed only weight barely exceeds one pound
  • High volume toe box and extra headroom for gear storage and roomy comfort
  • Item #ODRZ8NB
Responsible Collection
Bluesign Approved
[membrane/laminate] Helium AscentShell (3-layer), [face fabric] (fly) 30D nylon, PU coating, (floor) 40D nylon, TPU coating
mesh canopy
fully sealed
Floor Dimensions
83 x 28in
Floor Space
79 x 32.5 - 22 x 19in
Packed Size
3.5 x 12.25in
Trail Weight
1lb 0.8oz
Packed Weight
1lb 2.6oz
mountaineering, backpacking, ultralight backpacking
Manufacturer Warranty