Helium Bivy

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Award-winning for its ultralight prowess, updated with our most durable lightweight Helium fabric with Diamond Fuse technology. This clamshell opening bivy is ideal for fast and light missions.

The Helium Bivy is Outdoor Research's lightest, best-selling, and most-awarded bivy sack of all time. Incredibly quick to set up and break down, 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. A clamshell opening makes it easy to get in, get out, and resists wear and tear for future seasons of adventuring to come. This is the ideal shelter for minimalists who are looking to trade weight for speed, agility, and performance.

The tapered shape of the Helium Bivy works best with tapered sleeping pads with narrower dimensions at the foot, ideally 19 inches or narrower.


Outdoor Research
Mfg Sku/Part Number:
-- bluesign®-approved Pertex® Shield Diamond Fuse 2.5L 100% Nylon, 30D Ripstop Upper
-- 100% Nylon 40D with TPU lamination Floor
-- bluesign®-approved 100% Polyester Mesh
15.8oz / 448g with pole, 14.5oz / 400g without pole
Head of Bivy Width:
26 in. / 66 cm
Foot of Bivy Width:
19 in. / 48 cm
82 in. / 208 cm
Top of Bivy Height:
19.75 in. / 50 cm
Packed Dimensions:
12.25 x 3.5 in. (31 x 9 cm)
Fabric Performance:
  • Waterproof
  • Breathable
  • Ultralight
  • Fully Seam-Taped
  • Durable
  • No-See-Um Mesh
Design Features:
  • Single-Pole System
  • Reflective Logo and Trims
  • Two Stake Loops
  • One Guy Line Loop
  • High Volume Toe End
  • Clamshell Opening
  • Two Internal Fly Fasteners

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