Outdoor Research
Outdoor Research Alpine XT Bivy (2026 hooped bivvy bag)
- Weight: 7/10 How much it adds to your pack.
- Rain protection: 7/10 How well the fabric keeps out heavy, long rain.
- Packed size: 7/10 How much room it takes in your rucksack.
Solo mountain trips and alpine routes where the weather can turn, rated by Outdoor Research for four seasons
- Style
- Hooped
- Weight
- 594 g
- Fabric
- Not published
- Floor
- Not published
- Membrane
- Pertex Shield Air 3-layer with electrospun laminate
- Inner length
- Not published
- Packed
- Not published
Where to buy
Ultralight Outdoor Gear £344.99 In stock. Free delivery. RRP £394.99 as shown by the shop.
View at shop: Ultralight Outdoor GearPrices checked 8 Nov 2026 on each shop's own page; shops can change them. We earn no commission on these links; shops are listed by price. More
Our ratings (out of 10)
1 to 10, compared with the whole market. Each says what it's based on. How we score
Weight
From maker's figures 7/10How much it adds to your pack. 7: Better than most.
Outdoor Research gives 594 g, in the 400–599 g band, close to the 600 g line. It does not say what is included. Ultralight Outdoor Gear lists 626 g for the bag (550 g) plus pole (76 g) without pegs, which would be in the 600–899 g band.
Rain protection
Estimate from maker's specs: waterproof fabric the maker names (no waterproof figure published) 7/10How well the fabric keeps out heavy, long rain. 7: Better than most.
Estimate from maker's specs
Packed size
Estimate from maker's specs: bivvy weight (no packed size published) 7/10How much room it takes in your rucksack. 7: Better than most.
Estimate from maker's specs
In short
Good for
- Solo mountain trips and alpine routes where the weather can turn, rated by Outdoor Research for four seasons
- Exposed pitches where a single DAC pole and stakes give a stable, low shelter
Strengths
- Light for a four-season bivvy at 594 g (Outdoor Research's figure)
- 3-layer Pertex Shield Air upper with a passive vent flap and large mesh screen for airflow
- Fully seam-taped, with a 40D PU-coated floor
- Large side opening and a high-volume toe box that keeps the sleeping bag lofted
- Single DAC aluminium pole for headroom, with stakes included
Weaknesses
- Weighs 626 g with the pole: protective rather than minimal, in Ultralight Outdoor Gear's words
- Condensation control is improved, but careful venting is still needed in humid conditions
- Restless sleepers will brush against the fabric
- Relies on a 76 g DAC pole and stakes to hold its shape
Sources
We haven't tested this ourselves. Every score comes from these specs, tests and reviews.