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Outdoor Research Helium Bivy review

The only listing here to publish two deniers and name its membrane — and one that gives no dimension, no weight, no packed size and no waterproof figure.

What this listing puts on record

A slate-colored bivy in Pertex Shield Diamond Fuse 2.5L, a 100% nylon 30D ripstop upper over a 100% nylon 40D floor with TPU lamination, with a bluesign approved polyester mesh. That is the entire published specification.

What the fabric block does say

30D upper, 40D floor. The hub intro sets this out as the pattern to look for, and this is the only listing here that publishes both numbers. The heavier floor is the part that survives being pitched on gravel.

A named membrane. Pertex Shield Diamond Fuse in a 2.5-layer construction, rather than the unnamed laminates elsewhere in the hub.

What is missing

Everything else. No length, no width, no height. No weight. No packed size. No hydrostatic head behind the word waterproof, and no breathability figure at all — on a bag whose whole design argument is the membrane it names.

Before ordering

Nothing on this page tells you whether it fits you or your mat. Those figures have to come from the maker’s own documentation, not from the listing.

Availability

The American Amazon store was listing it at about $170 at the time of writing.

Every figure here is what Keepa held on the day this page was last revised. Offers and prices shift without warning.

Prices quoted in this text were read on October 23, 2026. The live price is at the top of the page.

What it does well, and where it gives way

Strengths

  • Publishes two deniers, 30D over 40D, which is the construction the hub intro describes and nothing else here states
  • Names the membrane and its construction — Pertex Shield Diamond Fuse, 2.5 layer — rather than calling it a laminate
  • States bluesign approval for the shell, the floor and the mesh separately

Compromises

  • No weight and no packed size published, on a bivy whose name is about being light
  • No dimensions of any kind, so whether a body and a mat fit inside cannot be established
  • Waterproof is claimed with no millimeter figure, and breathability is not claimed at all

Where this model is listed

A listing is not an offer: the reference exists on these stores, availability changes daily.

  • France
  • Germany
  • Italy
  • Spain
  • United Kingdom
  • United States

Specifications

FabricPertex Shield Diamond Fuse 2.5L, 100% nylon ripstop upper; 100% nylon floor with TPU lamination; 100% polyester mesh — stated, all bluesign approved
Denier30D upper and 40D floor — stated
Hydrostatic headNot published on the listing — the listing says waterproof and names the membrane, without a millimeter figure
Breathability figureNot published on the listing
Breathability test namedNot published on the listing
Seam tapingNot published on the listing
ConstructionNot published on the listing — the listing publishes materials only, with no pitched or cut dimensions and no mention of a pole
Entry and closureNot published on the listing
Packed sizeNot published on the listing
WeightNot published on the listing
Amazon referenceB0BSKS163Z
EAN0727602911472

What people ask before buying

What does 30D over a 40D floor tell you?

It is the construction the hub intro describes: a lighter canopy over a heavier floor, because the floor is what meets gravel. Publishing both numbers is rare here, and it is the one part of this listing that is fully answered.

Why does the most expensive bivy publish the least?

That is the finding, and it repeats across this niche. This listing gives a materials block and nothing else — no dimension, no weight, no packed size, no hydrostatic head. Price does not predict how much a maker publishes, and on this page it runs the other way.

Does Outdoor Research publish a hydrostatic head?

No. Not published on the listing — the listing says waterproof and names the membrane, without a millimeter figure. What the listing does publish instead is the fabric: Pertex Shield Diamond Fuse 2.5L, 100% nylon ripstop upper; 100% nylon floor with TPU lamination; 100% polyester mesh — stated, all bluesign approved.

Our score

7.8/ 10

A materials block without a product around it. Two deniers and a named membrane, and not one figure you could pack, pitch or fit yourself into.

The buyer this one serves, among camping gear

A buyer who knows this model already and is reading the listing for its fabric specification.

Sources

Specifications: the manufacturer sheet for camping and hiking gear and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.

What we look at on this camping gear