Outdoor Research Helium Bivy - Pewter Features_Wide Fit The largest of our AirZone

The largest of our AirZone Active packs features all the same details as our smaller packs but with a more substantial hipbelt

trekking or motorbiking

ideal for stashing wet gear

The removable backframe

With a volume of 85 litres

Outdoor Research Helium Bivy - Pewter Features_Wide Fit The largest of our AirZoneThe Helium Bivy is Outdoor Research's lightest, best selling, and most awarded bivy sack of all time. Incredibly quick to set up and breakdown, the ultralight Helium Bivy is 14% lighter than its last generation, and has everything the outdoor minimalist needs to be comfortable. Thru hikers and bikepackers love the Helium for its refined footprint and reduced weight, and trust it for its durable, lightweight, waterproof Pertex Diamond Fuse technology.