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Outdoor Research Ascent Shell Bivy

The Outdoor Research Ascent Shell Bivy is a top of the class solo adventure hooped bivy bag, ideal for alpine pursuits, extreme weather or fast and light expeditions. 

Building on the standard set by the original Alpine Bivy, the Ascent Shell Bivy employs Pertex technology to dramatically decrease condensation and therefore provide a more comfortable nights sleep. Primarily developed for use in the Outdoor Research clothing range, the Ascent Shell fabric is completely waterproof, breathable and incredibly light weight.

A step-in opening negates the need to shimmy into the bag, with an extra large head space that makes room for your gear to stow while sleeping. Ideal for use in any climate, the addition of a mosquito mesh comes in handy for when the bugs are out and about! 


  • Single pole system, with two stake loops and one guy loop
  • Large side opening
  • Extra head room to store gear
  • High volume toe end
  • Extra large mesh screen
  • Ultralight breathable and waterproof fabric
  • Taped seams


  • Season : 3 - 4
  • Packed Weight : 555 g
  • Minimum Weight : 528g
  • Dimensions: Length 210cm | Width (shoulder): 71cm
  • Packed Size : 9 x 31 cm 
  • Materials: Ascent Shell x Pertex Shield Air Diamond Fuse Nylon upper, 40D Nylon laminated floor, Polyester mesh

Related Collections

  • For our complete range of Bivy Bags, check out our Bivy Bag Collection
  • For our full range of Outdoor Research products, check out our Outdoor Research Brand Page

Personal Shopping - By Appointment

Would you like to try on some climbing shoes, running shoes or mountain boots for size before you make your purchase? If so, then why not book an appointment with us today! We can offer you a bespoke one-on-one shopping experience with one of our experienced staff members.