Outdoor Research Helium Bivy — Waterproof, Insect-Proof Ultra-Light Bivouac Sack

Ultralight shelter for unpredictable nights

The Outdoor Research Helium Bivy is built for solo treks where every gram counts. Its waterproof shell and insect-proof mesh create a protected inner space that stays dry and breathable as weather moves through the campsite. You get a calm, compact shelter that fits in a pack pocket and deploys quickly when night falls.

Key benefits include protection from rain and bugs, durability in rugged environments, and a surprisingly light footprint for a bivouac sack. The bluesign approved collection signals a responsible approach to textiles and finishing, while thoughtful construction keeps setup simple and reliable on trail or at the base of a stormy ridge.

• Waterproof and insect-proof performance in a single-pole bivy
• Delrin single-pole system enables fast, taut setup
• Pertex Shield Diamond Fuse 2.5L membrane plus 30D face fabric for resilience

• Ventilated interior via no-see-um mesh canopy reduces condensation buildup
• Durable floor fabric built from 40D nylon with TPU coating supports rugged use
• No-see-um mesh keeps insects out while allowing airflow on calm nights

Materials and construction

The shell combines a Pertex Shield Diamond Fuse 2.5L membrane with a 30D ripstop face fabric for weather resistance, while the floor uses 40D nylon. A TPU coating enhances weather sealing, and the inner mesh offers breathable ventilation without openings for insects. The unit uses 100% polyester mesh in the canopy for added airflow.

How it performs in real-world use

On a damp alpine approach, the Helium Bivy can be pitched beneath a sheltered rock overhang for a compact, dry sleeping area. In warmer seasons, it serves as a breezy, bug-proof resting spot after long hikes. Its lightweight design makes it a practical choice for minimalist setups and emergency carry.