Free shipping on orders over $99

Which Bivy is Right for You?

Author: Outdoor Research

February 10, 2019

After years of user feedback, and decades of product testing and tinkering, Outdoor Research is proud to release a completely redesigned bivy program that harnesses the power of innovative technology and ultralight materials to create a bomber shelter in the most compact construction yet.

This entire line of bivies weigh significantly lighter than their predecessors, and feature a smaller footprint that saves on pack space and weight for convenience, comfort, and effectiveness. Our ultimate goal was to create shelters that weigh less than a single person tent, and the result is a streamlined collection of bivies ideal for thru-hikers, bikepackers, and fastpackers looking to shed ounces and maximize performance.

Browse our bivy sack guide below to find out which features, technologies, and shelter choice is right for you.

Interstellar AscentShell Bivy

Interstellar Bivy

Four-season waterproof, durable, and versatile bivy choice for adventurers looking for a little something extra out of their shelter.

Stargazer AscentShell Bivy

Stargazer Bivy

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

Alpine Bivy

Alpine Bivy

GORE-TEX waterproof power for winter mountain missions.

Helium Bivy

Helium Bivy

Award-winning for its ultralight prowess, made even lighter.

Helium Emergency Bivy

Helium Emergency Bivy

Under 10 oz. of adventure insurance that packs down to the size of a beer can.

Browse All Bivy Sacks.

Photos by Elise Giordano.

Outdoor Research

Outdoor Research® is dedicated to inspiring the journey ahead with award-winning technical apparel and accessories. Based in Seattle since 1981, we are committed to improving our customer’s experience through innovative materials, purpose-driven features, and versatile products that are backed by our Infinite Guarantee®. We rely on the real-world testing of our athlete ambassadors, mountain guides, and local adventurers involved in our core sports: alpinism, rock and ice climbing, hiking, backpacking, paddling, trail running, and backcountry skiing and snowboarding. We’re here for the fun, adventure, excitement, and For the Journey Ahead™. Get to know us at or follow along on the journey via Facebook, Instagram, Twitter, and YouTube.