Josette_Te575701wrote a review of Outdoor Research Helium Bivy on May 29, 2016
Got this for bushwhacking hikes where a tent would be too big. I used it last weekend and really liked the ease of getting it out and being ready- much lighter and easier than a tent. I'd read about some pros and cons with this bivy, so here goes in reference to some of them.
1. Design and roominess- I found it to be quite roomy; I get to feeling easily bound up with my feet and there was plenty of room for flipping over and the such. I kept a change of clothes in the bag with me along with my phone and bear spray/whistle. I am 5'4 and 130 lbs, but I bet that someone with average height and build would be fine.
2. Condensation- I don't know that I got to test this fairly as it was 50 degree sleeping weather. I slept with my mummy bag open and didn't sweat much. However, one other co-hiker noted that his bivy got pretty wet, so maybe there's something to that...
3. Ventilation- I never had to fully close down the hood, but slept with the bug shield and never felt smothered. I did note, however, that the hood kept falling over onto my face, so it would need to be staked open to keep it lifted. Further, I placed something at the bottom end to keep that area lifted off the feet, and it was quite airy.
4. Amenities- I hadn't noted that there was a little pocket- so that was a bonus. It's only 3 x 5", but that's enough to keep little things from floating all over your bag. Also- the sleeping pad straps really work. We were on a bit of a slope- so I slid a little, but the pad stayed in place.
This bivy is not an eye catcher- but it has great features. In fact, when my husband saw it, he quickly went and ordered one for this last trip, since it was so much nicer than his current bivy.
So far, it's a Five star for me...