The Ultimate Ultralight Shelter

The Outdoor Research Helium Bivy is an award-winning ultralight shelter built for minimalists who prioritise speed, efficiency, and pack weight.

Now updated with Pertex® Diamond Fuse technology, it delivers enhanced durability without compromising its renowned lightweight performance. Whether you're thru-hiking, bikepacking, or heading into the mountains fast and light, this bivy provides reliable waterproof protection in a compact, streamlined design.

With its clamshell opening, refined footprint, and rapid setup, the Helium Bivy is trusted by adventurers who want to move fast without sacrificing essential protection.

Why You'll Love It

Ultralight design - One of the lightest bivy shelters available
Pertex® Diamond Fuse - Stronger, more durable fabric
Waterproof & breathable - Reliable all-weather protection
Clamshell opening - Easy entry and exit
Compact & packable - Perfect for minimalist adventures

Built for Fast & Light Missions

Perfect for:

Thru-hiking
Bikepacking
Fastpacking
Minimalist camping
Emergency alpine use

Designed for speed, efficiency, and simplicity

Performance Features

Ultralight Shelter System

484g with pole / 432g without

Benefits:

Reduced pack weight
Faster movement
Ideal for long-distance missions

Pertex® Shield Diamond Fuse Fabric

Advanced 2.5-layer waterproof construction

Provides:

Reliable waterproof protection
Improved durability vs previous versions
Lightweight performance

Clamshell Opening Design

Wide, durable entry system

Allows:

Easy access in and out
Less wear over time
Quick setup and pack down

Single-Pole Structure

Lightweight support system

Improves:

Headroom vs standard bivy sacks
Comfort when sleeping
Usability in varied conditions

No-See-Um Mesh Panel

Integrated ventilation and bug protection

Useful for:

Warmer climates
Summer bivy use
Improved airflow

Optimised Tapered Shape

Streamlined for efficiency

Best paired with:

Tapered sleeping mats
Max 48cm width at foot

Durable & Thoughtful Details

Includes:

Reflective trims
Stake loops + guy line loop
High-volume toe end

Improves:

Visibility at night
Stability in wind
Foot space comfort

Technical Specifications

Weight: 484g (with pole), 432g (without pole)
Length: 208cm
Width (top): 66cm
Width (foot): 48cm
Packed Size: 31 x 9 cm
Construction: Single-pole bivy
Upper Fabric: Pertex® Shield Diamond Fuse 2.5L, 30D Ripstop Nylon
Floor: 40D Nylon with TPU lamination
Mesh: Polyester no-see-um
Waterproof: Yes
Breathable: Yes

Perfect For

Ultralight hikers
Bikepackers
Fastpackers
Minimalist adventurers
Emergency shelter use