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#10 on this list
Escape Pro Bivvy
SOL
The emergency bivy to actually carry: breathable, reflective, and 8 ounces in a lid pocket.
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#1 on this list
Helium Bivy
Outdoor Research
Pertex Shield with a single hoop pole. The reference for fast-and-light alpine nights.
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Specs side by side
| Spec | Escape Pro Bivvy | Helium Bivy |
|---|---|---|
| Manufacturer | SOL (Survive Outdoors Longer) | — |
| Weight | 8 oz (227g) | 18 oz (approx) |
| Material | Proprietary metallized non-woven fabric | — |
| Packed Size | 3.5" x 6" (approx.) | Small water bottle |
| Weather Resistance | Water-resistant, windproof | — |
| Thermal Rating | Reflects 70% of radiated body heat | — |
| Fabric | — | Pertex Shield 2.5L |
| Waterproof Rating | — | Excellent |
| Breathability | — | Very Good |
| Pole System | — | Single aluminum hoop |
What our reviewers liked and didn't
Escape Pro Bivvy
- Excellent warmth-to-weight ratio
- Significantly more breathable than Mylar emergency blankets
- Extremely lightweight and compact
- Effective wind and light rain barrier
- Affordable for emergency preparedness
- Not fully waterproof in heavy rain
- Less durable than heavier, traditional bivies
- Limited space inside, not for comfortable lounging
Helium Bivy
- Exceptional weight-to-protection ratio
- Pertex Shield offers good breathability for a bivy
- Single pole creates crucial headroom
- Highly packable and compact
- Reliable weather protection for its class
- Can still have condensation in humid conditions
- Limited space, not for lounging
- Requires a ground cloth for optimal durability
- Not ideal for prolonged, multi-day downpours
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